Potion, very rare
When you drink this potion, your physical age is reduced by 1d6 + 6 years, to a minimum of 13 years. Each time you subsequently drink a Potion of Longevity, there is 10 percent cumulative chance that you instead age by 1d6 + 6 years.
Suspended in this amber liquid is a tiny heart that, against all reason, is still beating. These ingredients vanish when the potion is opened.
Notes: Reduces Physical Age, Control, Buff, Consumable
Clone does, in fact, work that way. It explicitly allows you to create a younger clone of yourself and you can apply it one by by one to the whole party to protect against death and aging in general as long as at least one party member has access to wish.