And lastly the Age-Away Serum can be made by a level 10 Scientist.
The Potion of Regeneration can be made by any level 10 Spellcaster, although it has a chance of failing and making your sim older. The Potion of Youth is available from the Aspiration shop and costs 1,500 Aspiration points. So it you are 3/4ths through Adulthood, drinking any of these would reset to day 1 of adulthood. Potion of Youth/Potion of Regeneration/Age-Away Serum: I’ve grouped these together as they pretty much do the same thing, which is to reset the current age of the sim. Hi, I posted this on the Sims forum, and I thought I'd post it here too, let me know if I've missed anything (credit to CK213 for the Necrocall and Dedeathify spells: