To stop aging in Inzoi, open Game Options, go to the Simulation tab and set Aging (My Zois) to Disable; set Aging (Other Zois) to Disable as well if you want the whole city frozen. Aging can also be slowed rather than stopped by changing the aging speed and day length settings in the same tab. This guide covers both, the birthday system that replaced midnight aging in 2026, the one interaction that ages a Zoi even with aging disabled, and how lifespans work now, all verified against official patch notes.
Disabling Aging in the Simulation Settings
The aging toggles arrived in the v0.1.4 hotfix on April 4, 2025, one week after Early Access launch, and the developer’s note describes them as settings for “Aging (My Zois)” and “Aging (Other Zois)”. They are still there:
- Pause the game and open Game Options.
- Select the Simulation tab.
- Set Aging (My Zois) to Disable to freeze your active household.
- Set Aging (Other Zois) to Disable if you also want NPCs and inactive households to stay put.
The two switches are independent: freeze only your household while the city ages around it, or the reverse to keep the same neighbors forever.
One detail from the v0.2.0 update: aging for idle families is disabled by default and toggled separately, so households you created but are not playing do not age unless you tell them to. The same update made hovering over a Zoi show their age group and the days until the next one, the quickest way to check whether your setting took.
Slowing Aging Instead
If you want life stages to pass, just more slowly, two settings in the Simulation tab control the pace:
- Aging speed. Since the v0.8.0 update, “the number of days is now displayed alongside each aging speed setting in game options”, so you can see exactly how many in-game days each option gives before choosing.
- Day length. This sets how many real minutes an in-game day lasts. The default changed in the v0.4.0 update: “After this update, the default day length will automatically be set to 48 minutes. Players who prefer the previous version can change it to 96 minutes.” The 2025 build defaulted to 96, so an older guide’s numbers will be off by half. Longer options are available for players who want a slow burn.
Changing day length used to break needs; the v0.4.5 and v0.5.0 patches fixed need decay and interaction speed not matching the new length, so it is safe to change mid-save on the current build.
Birthdays, Grow Up and the Aging Exception
In 2025, Zois aged silently at midnight, which the developer called out as a problem in their January 2026 roadmap post. The v0.7.0 update in March 2026 replaced that with a 28-day calendar that shows birthdays, and per the notes “Zois will advance to the next stage of their lives on their birthdays after performing one of the following actions”: blowing out candles at a birthday party social event, or spending the birthday alone without blowing out any candles.
That creates the one exception to a disabled aging setting. The v0.7.3 hotfix states: “When performing the Grow Up or ‘Extinguishing birthday candles’ interaction, aging will proceed regardless of the ‘Disable Aging’ option.” In other words, disabling aging stops the clock, but a manual Grow Up or a birthday cake still moves a Zoi forward. If you want a Zoi frozen, skip the candles. If you want to age one Zoi on purpose while the rest stay frozen, the Grow Up interaction is the tool.
The v0.7.2 hotfix also mentions a stopAging cheat alongside the Age Off option when fixing saves where Zois aged anyway, so a console cheat exists for the same job. The settings route is the one we recommend because it survives reloads without retyping.
Life Stages and Lifespans on the Current Build
Inzoi runs Zois from newborn through toddler, child, adolescent, teenager, young adult, adult, middle-aged and senior. The 2025 version of this guide listed a day count for each stage, but those numbers were rebalanced in v0.2.0, which “significantly extended” the young adult stage, shortened middle age and lengthened every stage from infant to teenager. With aging speed settings now showing their own day counts in the options menu, the in-game display is the source to trust rather than any table.
On death, two rules matter:
- Only seniors die of natural causes. The v0.1.3 hotfix changed lifespan rules “so that only Zois in senior age groups may now pass away naturally”; before that, Zois could die young on realistic odds.
- Zois created as seniors got a longer fuse in v0.4.0 to stop them dying almost immediately.
Disabling aging keeps a senior alive indefinitely, since they never reach the end of the stage. Babies benefit the same way; if you just had one, our guide on how to have a baby in Inzoi covers the newborn stage, and how to go to school covers what happens once a frozen child is unfrozen. Whatever you pick, save your game after changing settings, and browse the rest of our coverage on the Inzoi guides hub.
Frequently Asked Questions
Where is the aging setting in Inzoi? Game Options, Simulation tab. Aging (My Zois) and Aging (Other Zois) can each be set to Disable.
Why did my Zoi age up with aging disabled? A birthday party or a manual Grow Up interaction ages a Zoi regardless of the setting, per the v0.7.3 hotfix. Skip the candles to keep them frozen.
Can I stop aging for just one Zoi? Not through settings, which work per household. Disable aging for the household and use Grow Up on the Zois you do want to age.
Does disabling aging stop death? Natural death only happens to seniors, so a Zoi who never reaches or never leaves the senior stage does not die of old age. Accidents and disasters are separate.
What is the default day length now? 48 minutes since v0.4.0. The launch default was 96 minutes and is still selectable.