It also is rather easy to get, though you've got to be level 10 in the Career. Scientists can make the Age-Away serum, which will reset a Sim's age back to day 1 just as the other options do. Get to Work - Scientist and Cloning Machine You can learn more about Cow Plants in the Gardening Guide. Do it a second time, and the Sim dies and leaves behind the essence, which is available when you milk it. Do this once, the Sim gets a negative moodlet. Don't feed the cow plant, and have them in a place guests will mingle or else have one of your own Sims take the cake it puts out as bait when hungry. When a cow plant kills a Sim, they give an essence of life that can be drank, offering the same benefit as a Potion of Youth. However, there are other a couple of other options. This is my main go-to for keeping Sims young.
You can even transfer these between Sims. Simply accrue 1,500 Satisfaction points by pursuing Whims and your Sim's Aspiration. Use it right before they age up for maximum value. The potion only gives one drink, but will reset the Sim back to the beginning of their current age group. The Potion of Youth Reward is the easiest means of keeping a Sim youthful without cheating. Setting the Life Span to long will make children and teens take quite some time to age up, but you'll have loads of time to accumulate satisfaction for the following reward. You can select whether all Sims age, or only those in your household, or disable aging entirely. Know that there are aging settings in The Sims 4's gameplay options menu. Let's explore some of the means of life-extension in the game, and what we can do to make that a regular part of the Sim's life. Some involve cheats, while others do not. There are a few ways to make your Sim live forever in The Sims 4. Potions of Youth do the same, costing 1500 Satisfaction. The Sims 4 Age Extension and Immortality Drinking the Essence of Life from a Cow Plant will reset your Sim back to day 1 of their current life stage.