Aging down

Hello! I would like to suggest adding a potion and/or spell in the game that allows our sims to become younger, or age down. Maybe there can be a "fountain of youth" as well. All of the ingredients/requirements should be challenging to get/do. My main sim who is spellcaster has been dead for months (real time) and I just brought her back to life. Now I wish I could make her younger. I don't want to use cheats because part of the reason I play is to complete the aspirations and get the rewards. Please do this! :)