Harvard professor David Sinclair reveals breakthrough research showing human cells can be rejuvenated by 75% in 8 weeks, with first human trials launching this year to reverse blindness and potentially cure age-related diseases. His Information Theory of Aging explains why aging is a treatable disease, not inevitable decline, and he details proven lifestyle interventions—fasting, exercise, specific supplements—that can extend healthy lifespan by 10-20 years. Aging is caused by loss of epigenetic information (identity crisis in cells), not DNA damage itself, and can be reversed by reinstalling cellular 'backup copies' from youth through gene therapy.