Rejuvenation

Rejuvenation is the ability to reverse the aging of a living being to a more youthful state, usually through magic.

Mainstream Smurfs Media
In mainstream Smurfs media, rejuvenation is usually through magical items or sources such as a fountain of youth, which the Smurfs have encountered twice in the cartoon show. The Reverse Clock in Father Time's workshop also has the ability of rejuvenation, causing whoever enters into it to have their aging reversed to a youthful state.