The article discusses the significant delay in human aging, which has been documented since 1994 and continues to be a fundamental discovery in the biology of human aging. This delay is attributed to improvements in health rather than a deceleration in the rate of deterioration with age. The rate of death increase with age remains constant, suggesting that people are reaching old age in better health. Research suggests that further progress is likely to be made in advancing survival and healthy survival to even greater ages. The postponement of mortality has led to a rapid increase in centenarians and has implications for society, including changes in employment, retirement, health, and education policies. Genetic factors play a modest role in determining lifespan, and the progress in lengthening lifespans is primarily due to medical and public health efforts, rising standards of living, better education, and healthier lifestyles. The future of human aging may involve very long lives for younger people today, and the dynamics of heterogeneous populations are discussed to explain the observed trends.The article discusses the significant delay in human aging, which has been documented since 1994 and continues to be a fundamental discovery in the biology of human aging. This delay is attributed to improvements in health rather than a deceleration in the rate of deterioration with age. The rate of death increase with age remains constant, suggesting that people are reaching old age in better health. Research suggests that further progress is likely to be made in advancing survival and healthy survival to even greater ages. The postponement of mortality has led to a rapid increase in centenarians and has implications for society, including changes in employment, retirement, health, and education policies. Genetic factors play a modest role in determining lifespan, and the progress in lengthening lifespans is primarily due to medical and public health efforts, rising standards of living, better education, and healthier lifestyles. The future of human aging may involve very long lives for younger people today, and the dynamics of heterogeneous populations are discussed to explain the observed trends.