Rejuvenation, the restoration of youthfulness or vitality, includes both medical and philosophical endeavors. Unlike life extension, which aims to slow aging, rejuvenation focuses on repairing or replacing damage caused by aging. Throughout history, myths such as the Fountain of Youth and alchemical searches for the Philosopher’s Stone highlight humanity's enduring interest in reversing aging.
Thinkers like Ferdinand Julius Cohn viewed it as nature's ongoing renewal, while James E. Talmage connected it to spiritual rebirth. Contemporary science investigates hormonal treatments, epigenetic reprogramming, and stem cell regeneration, illustrating a progression from ancient legends to advanced biological research. Rejuvenation therefore connects cultural aspirations with biomedical breakthroughs, striving to harmonize the transient with the eternal.