You imbue a cauldron with the power to make one creature young again. Once the spell is cast, the cauldron retains its power for up to one hour. To draw on the cauldron’s power, you or another person must cut the throat of the person to be made young and make them drink from the cauldron (this also heals the neck wound). The creature is immediately restored to their physical prime, which for humans is normally somewhere around age 25. The creature loses all current Strength, Dexterity, and Constitution penalties from ageing but accrues later ageing penalties normally based on the creature's new apparent age.

The spell does not actually extend the creature’s lifespan. He dies according to his original maximum age, even if he still looks young and even if that means he dies a matter of months after regaining his youth with this spell.