Scientists weigh the prospects and limits of achieving human immortality

Humans uniquely recognize their mortality, a realization that drives cultural, religious, and scientific efforts to overcome death. Modern medicine has reduced deaths from violence, disease, and famine, yet aging populations create new public-health pressures to delay functional decline. Researchers are exploring multiple avenues—caloric restriction, drugs like rapamycin and metformin, senolytic compounds, and blood-factor studies—to slow aging, but side effects and limited efficacy remain concerns.

More ambitious approaches involve partial reprogramming of cells using Yamanaka factors, which has rejuvenated tissues in mice but raises safety and delivery hurdles. Despite substantial investment from tech billionaires, the author concludes that no single intervention can simply switch off aging, and true immortality remains unlikely in the near term, leaving diet, exercise, sleep, and social engagement as the most reliable strategies today.