The Science of Aging: Why Do We Age Biologically?

Aging is a complex biological process driven by the gradual accumulation of cellular damage over time. Scientists have identified nine hallmarks of aging, including genomic instability, telomere attrition, and mitochondrial dysfunction.

Telomeres — the protective caps at the ends of your chromosomes — shorten each time a cell divides. When they become too short, cells stop dividing and enter a state called senescence. This is a key driver of age-related decline.

Other factors include oxidative stress from free radicals, loss of protein homeostasis (proteostasis), impaired nutrient sensing, stem cell exhaustion, and altered intercellular communication.

Research into anti-aging therapies focuses on slowing these processes through caloric restriction, senolytic drugs that clear senescent cells, and lifestyle interventions like exercise and sleep optimization.

While we can't stop chronological aging, understanding the biology of aging helps us make choices that may slow biological aging — and our age calculator helps you track the chronological side precisely.