August 21, 2026

Lifespan Adjuster

With this online tool, you can drag the sliders to easily adjust your Sims' (and animals!) lifespans to suit your needs and download a package file ready for your Mods folder.

How to use:

  1. Adjust the sliders for each life stage to your liking using the online tool.

  2. Click the "Generate Package" button to download a package file containing your custom settings, which is ready to drop into your Mods folder.

  3. You won't see any new interface features in the game; your Sims' lifespans will simply update to match the lengths you configured online.

AVAILABLE FOR FREE HERE:


Please consider supporting me on Patreon

Your support helps me create more tools and mods for the community!

Comments (129)

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Lucie Bartolo · October 15, 2026

Comment faire si j'ai plusieurs save avec un souhait de régler les durées de vie différemment ?

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Martin · October 7, 2026

hi! I love this! but I'm getting an XML error when trying to get the package: https://www.simmattically.com/lifespan-adjuster/?newborn=2&infant=4&toddler=5&child=14&teen=21&young_adult=40&adult=42&elder=30&cat_child=2&cat_adult=30&cat_elder=11&dog_child=2&dog_adult=25&dog_elder=9&horse_child=7&horse_adult=50&horse_elder=13

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Bluwails · October 5, 2026

For FREE?????? may your steaks forEVER be juicy and lobsters extra buttery!

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Maggie Moss · October 4, 2026

you are a genuine heaven sent for sims players

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. · September 30, 2026

SLAYYYY oh my god your mods are amazing

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Mandy Lynn · September 21, 2026

Oh, my goodness, I just started following you and now I may subscribe to you!!! THIS separates you from most people to be this awesome to offer this for FREE!!!!

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Tyler Forrest · September 20, 2026

INSANITYYYYYYYUHHHHH God bless you!!!!

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Logan Lobo · September 20, 2026

if I had a job I would so subscribe

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Danhoil · September 20, 2026

Hiya, this is awesome thank you! would it be possible to have a slider reach immortality? It would be really cool if you can have newborns to teens age and when they reach adults they stop ageing.

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Dakota Elizabeth · September 17, 2026

you are a actual god send THANK YOU SO MUCH

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Yuiri · September 14, 2026

So, does this only work on normal lifespans, or how do we go about adding one for each length? Could I customize both normal & long lifespans and download a package for each one respectively, or would this conflict?

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Sam D. · September 18, 2026

Yes, wondering this too.

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SulSulKiya · September 11, 2026

AMAZING!!!!

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IRISss · September 7, 2026

!!!!LOVE IT

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das_moendchen · September 4, 2026

This is so cool! Thank you for sharing this for free with us!

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beachwayves · August 31, 2026

I'd love a higher tier, I'm fortunate enough to be able to support my favourite creators generously, it would be amazing if some of us could offer £10-£15 a month. I understand mccc lifespans will conflict, does anybody have any advice for those of us that already have custom lifespans with it? How do I reset it to use this mod instead?

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SimMattically · August 31, 2026

Hey! To answer your question about MCCC, I'm not sure how to clear saved age settings specifically within the in-game options. I know you can clear all of your settings by deleting the MCCC config files in your Mods folder, but that will affect everything. Regarding your suggestion about a higher tier – first, thank you very much! As I understand it, the tiers are minimum-pledge based, but you can actually donate as much as you wish. Patreon has a tutorial about it here: https://support.patreon.com/hc/en-us/articles/360000126286-How-to-change-your-tier-a-guide-for-members

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SulSulSimah · August 30, 2026

I've never commented on someones post, But this is too good to not reply!!! I use so many of your overrides and mods you truly make the game more playable <3

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Yam-Zeita · August 30, 2026

Thank you so much for this cool mod I've always loved finetuning my lifespan in the sims 3

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Diamond · August 28, 2026

Thank you so much!!

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heidi (Team de luniversims.fr) · August 28, 2026

It looks like my status is being suppressed on your buttons; I don't understand what's going on. I'll wait for their response and explain my new issue again. Best regards.

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bratBlaze · August 28, 2026

Goated...

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Athy Ara · August 27, 2026

I love you so much this is soooo what I needed

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bloomfelix · August 26, 2026

S2

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s o o k i 🍒 · August 25, 2026

This is amazing. WOW. No words.

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Justice Matthews · August 25, 2026

would love to see you do tools like cmar did or update his programs for the sims 4

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Justice Matthews · August 25, 2026

Omg im so happy your the best!

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Kioni Kamaria · August 25, 2026

I get it now!

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Chanise Walker · August 24, 2026

This is amazing! Your work is greatly appreciated!

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Dr. Saul · August 23, 2026

Omgggis that free! You are a god 😭❤️

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Peach Moon · August 23, 2026

I don’t usually comment on Patreon, and I haven’t played The Sims 4 in quite some time. However, seeing this mod has made me really excited, as I've been hoping for an extra-long lifespan mod for the Sims for years. Thank you! :D (I have a quick question: if I choose the long or epic lifespan, will it affect the months/years and for birthdays or it stay the same?)

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Ch1pp3dH34rt · August 22, 2026

You are god amongst us. Blessings to you and your house for the next 3 generations.

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DeMonica Price · August 22, 2026

Yep, wait until the first week of September. I will be supporting you on Patreon. Thank you soooo much <3! We do not deserve you.

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Tyesha McAskill · August 22, 2026

is there a vid with a tutorial i installed this app and now i dont know were to find the adjuster

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SimMattically · August 22, 2026

You won't find it in the game. The online tool has sliders that let you adjust each life stage length. Once you're done, you download a package file containing those settings, and installing it updates your Sims' lifespans in the game.

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S.I.S · August 22, 2026

dude you are the best

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SIMplycoya · August 22, 2026

You are truly making the sims 4 better in every possible way!! Amazinggg!!!

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Mary Miller · August 22, 2026

How does this work with MC Command Center, since that app also allows you to adjust lifespan?

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Daisha Anthony · August 22, 2026

how do you use it

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SimMattically · August 22, 2026

The online tool features sliders that let you adjust each life stage length. Once you're done, you download a package file containing those settings, and installing it updates your Sims' lifespans in the game.

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s · August 22, 2026

FANTASTIC SENSATIONAL AMAZING STUPENDOUS OH MY GOD

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Lady's Bug Life · August 22, 2026

Hmm, this may sound stupid, but how does this pair with MCCC, cuz you can adjust the lifespan too, does it have to be either or?

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Lardbard · August 27, 2026

That’s what I’m wondering too

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RubyRube · August 22, 2026

I LOVE YOU

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Delsin Hruby · August 22, 2026

Holy lord! I wished for this forever! Sims 3 had this if I remember corectly and Im so happy to have it again :D I love you!

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Sandra Asare · August 22, 2026

You don't know what a help you are to us *heartemoji* ... If we could have that for seasons' length too, I'd go crazy.

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Midnight Rose · August 22, 2026

This is incredible!! You are incredible!! Tysm!!

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SimmingWithCaroline · August 22, 2026

You never fail to disappoint, always making our gameplay better!!

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Magestical Mysterium · August 22, 2026

I think you mean "You never fail to amaze us", "never fail to disappoint" sounds more like a disapproval really

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Sunny's Cottage · August 22, 2026

You've done it once again!! Such excellent work!

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Lalalala · August 22, 2026

You are such a genius!! Thank you!!!!!!!!!!!

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ShineBlue · August 21, 2026

WOW, THANK YOU!!

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Kelly Hodges · August 21, 2026

How does this work? I installed it, but I am not seeing it.

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kaikū · August 22, 2026

Make sure your Sim's lifespan is set to Normal in your gameplay settings!

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SarahElizaSims · August 21, 2026

For free? Thank you! I do want to know though, does this work for the active household or globally throughout all households? I'll hate for everyone else having different life spans!

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SimMattically · August 22, 2026

It changes the lifespan length values in the game, so it works globally.

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EmTheSimmer · August 21, 2026

OMGGGGG LOVEEEE! Was literally just thinking about the game having something like this because normal lifespan is too short and long lifespan is too long!

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KunU Goliazza · August 21, 2026

Thank you😭😭😭

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ctrlnatdel · August 21, 2026

This is insane! Thank you so much!

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Irina · August 21, 2026

omgggg thank u so much!

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nightshade · August 21, 2026

This is insane, you're pretty much singlehandedly fixing this broken ass game. I'm in awe

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*Silverwolf719* · August 21, 2026

This is amazing! Its so much better than doing it in MCC so thank you so much!! I will definitely support you once I have morestable income. You are one of my fav modders in this community and you create such beautiful work. Thank you so much! <3

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Angie · August 21, 2026

Omg ! Thanks a lot ! Really <3

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PrinceWugua · August 21, 2026

Thank you for the great mod! Can someone recommend how long lifespan you guys are using for like generation challege?

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KT Designs/Grinchk7 · August 21, 2026

Ok wow! This is amazing and so glad to see someone finally make this mod because it's very necessary...thank you so much again for all of your hard work!

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J9 · August 21, 2026

I am a happily paid Patreon because what would I do without your mods in my game?!?! Thank you for all you do and now I’m so anxious to get off work so I can add this to my game.

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Wren | WRNZWRLD · August 21, 2026

CRYINGGGG!! FOR FREE??? WE DON'T DESERVE YOU *cried more happy and grateful tears*

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Mickey Cruz-Taylor · August 21, 2026

Oh my gosh!!! THANK YOU SO MUCH FOR THIS AMAZING NEW TOOL!!! We'd be lost without you! <3

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Random Onlooker · August 21, 2026

Wow, so cool!

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simmerdayday_plays39 · August 21, 2026

The Goat

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Laura Colin · August 21, 2026

Is this going to affect the age span thing that mccc have? and I absolutely love your mods thank you for making them

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J Elise Ortiz · August 21, 2026

Yes! 🙌🏼👏🏼🙏🏼

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VOX POPULI · August 21, 2026

I wish I can enter the number in because I can't use the sliders

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kaikū · August 22, 2026

You can use your arrow keys (up or right) to increase it by 1 (idk why it doesn't go lower though)

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Yasmine · August 21, 2026

You're an angel!!! I hoped for a mod like this for since i began to play the game!!

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Bambidays · August 21, 2026

WHYYYYYYYYYYYYY CAN'T EA DO THIS???????? Finally no more age long toddlers 😩😩😩 thank you so muchhhhhhhh 🩷🩷🩷🩷

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Mélanie · August 21, 2026

I'm so glad you made a mod like this, MCC was too complicated for me, now I can finally have exactly what I want for my sims! OMG I was always looking for something like that, thank you!!!

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Chofis Aquino · August 21, 2026

Wooow, that's amazing!!!

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Alexsis Brown · August 21, 2026

Not sure how to use this

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Katherine · August 21, 2026

read the description it says it right there ;)

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Juli-146 · August 21, 2026

That's great. How can I use it after installing it? I can't find it.

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Katherine · August 21, 2026

read the description it says it there ;)

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DAVID EVANS · August 21, 2026

Ideal! Thank you!

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Lilaclovebug · August 21, 2026

so with this i should probs change my lifespan back to normal with mccc before putting this in my game, correct?

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SimMattically · August 21, 2026

I don't know how MCCC changes the lifespan, but they will definitely conflict. I believe you can still use MCCC just fine, but do not change your lifespan settings in there if you use an override from my tool.

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KylaJaz · August 21, 2026

Love this! If we use mccc for lifespans should we reset that or is this compatible?

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SimMattically · August 21, 2026

I don't know how MCCC changes the lifespan, but they will definitely conflict. I believe you can still use MCCC just fine, but do not change your lifespan settings in there if you use an override from my tool.

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heartquake · August 21, 2026

MY GOATTTT

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TAWANNA PARKER · August 21, 2026

This is so dope! I wish we had something like this where we can set the ages we want for our sims realistically on top of this lifespan mod and it would be ultimate/epic for me, everything I've been wishing for. Thank you SimMatically for this mod, you are amazing and the best to ever do it.

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yuka4cas · August 22, 2026

timelines by ellesimsworld is a good mod for ages!

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Fade Johanssen · August 21, 2026

oh this is SO good

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GXW1995 · August 21, 2026

You are obviously a great creator. Although I am not quite sure how to use this mod, I must say that you are amazing. Currently, everyone in my game is immortal (except for animals)

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taliaisonline · August 21, 2026

you make this game playable 😭 THANK YOU!!!

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SimT2028 · August 21, 2026

This is incredibly cool.

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Catey Poillion · August 21, 2026

omg. you're the best. i've been struggling with aging in my legacy save file for SO LONG. thank you!!

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NoNayNever · August 21, 2026

Very useful mod! Thanks for releasing it for free! I'm wondering, would you be able to make a mod for seasons? Ever since I started playing S4 I've missed the way it worked in S3 - being able to adjust each season individually and even turn seasons off completely. I never played S2 but I know many people liked the way you could also re-arrange the seasons in that iteration. It feels so limiting to not be able to control the seasons more in S4. Is it something that's moddable and would you consider trying to mod it?

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SimMattically · August 21, 2026

I believe seasons are much more complicated and heavily related to how the game calculates... well, things...? And they have to be a multiple of 7, too, because of how the calendar works.

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manda_fruit · August 21, 2026

I love this idea! does it conflict the setting on MCCC if I use this package as override?

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SimMattically · August 21, 2026

I don't know how MCCC changes the lifespan, but they will definitely conflict.

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Astarion-softie · August 21, 2026

OMG WHATTTT

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Hope Davis · August 21, 2026

It’s giving Sims 3 😮‍💨😮‍💨 I’ve always wanted them to bring back that feature to do this and you’ve done it! Excellent 🥳

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Toni L · August 21, 2026

Epic!!!

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Iuri Galitó · August 21, 2026

truly you are godmattically 😮‍💨💓

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mica · August 21, 2026

AND FOR FREE????? YOU ARE REALLY CARRYING THIS BROKEN GAME AND MAKING IT WORTH PLAYING

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nikki · August 21, 2026

You are a beast😍😍 THANK YOUUU if the sims ever goes down, we'll all remember your name

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vinesky · August 21, 2026

my ultimate decades challenge just got so much easier thank you!!!

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wystxria · August 21, 2026

omg am I gonna have to reset my lifespan settings in MCCC??

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CountryCritters · August 21, 2026

I am wondering that too...

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Kiwi · August 21, 2026

FOR FREE?????????????????????

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SimMattically · August 21, 2026

Thanks to the great support of my paid members, I'm able to dedicate way more time to these projects and I decided to share this tool for free with everyone! It's been on my mind for a while, so I'm really glad I finally got to build it and it's awesome seeing people already loving it. 😆

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Elena Sajeva · August 21, 2026

you are the best!!!

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Ammeecha Thomas · August 21, 2026

OMG definitely a game changer!!!! Thank you!!!!

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IrieGamerGyal Banton · August 21, 2026

Excuseee you? Just dropping this off like no biggie??? We do not deserve you💚😁💚😁💚

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Citywideset · August 21, 2026

This is amazing!!!

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socks · August 21, 2026

This is the most exciting thing since whatever the last most exciting thing was. I NEED to get off work NOW

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juicyyy · August 21, 2026

the goat! This is amazing omg

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Rebecca Ross · August 21, 2026

Immediately installed the moment i got the notification

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LadyDynasty · August 21, 2026

This is so great! I’m in awe of your talent

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Delphine · August 21, 2026

Sérieusement? moi qui joue sans mods je veux celui ci aussi ! ca manque tellement c'est excatement ce que je veux merci beaucoup !

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callum - · August 21, 2026

you are gonna make me COMBUST thank you for your service 😭🤍

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64rosesx · August 21, 2026

As always you are the best! You deserve your flowers, a cool pillow as you sleep, and all the other good things. ❤️

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swthailie · August 21, 2026

OUUU !

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BlankDude ._. · August 21, 2026

Mf can't stop cooking🔥🤌

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Chanel Oberlin · August 21, 2026

literally saving the sims community one mod at a time

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m0therx0fxcha0s · August 21, 2026

Slaaaay

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lay · August 21, 2026

YOU ARE ON A ROLLLLLLL OMG

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katsanxiety · August 21, 2026

SHUT UP 😭😭✨✨🩷🩷

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PrncssT 👑 Sims · August 21, 2026

Perfection again!! Thank you!!

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minkoos · August 21, 2026

WHATTTTT 🤭