We all know our age. It’s printed on passports, used on forms, and quietly shapes how we think about ourselves. But when it comes to health, your chronological age is arguably the least interesting number you can know.
Because there are really two types of age: chronological age — how many years you’ve been alive, and biological age — how your body is actually functioning.
What Is Biological Age?
Biological age refers to the functional age of your cells, tissues, and organs. It can be measured through biomarkers such as epigenetic clocks (which assess DNA methylation patterns), telomere length, inflammatory markers, metabolic health indicators, and cardiovascular fitness.
Why the Gap Matters
Research consistently shows that biological age is a better predictor of health outcomes — including disease risk and mortality — than chronological age. Two people who are both 50 years old can have biological ages that differ by 20 years or more.
What Drives the Difference?
The gap between chronological and biological age is largely determined by lifestyle: sleep quality, exercise, nutrition, stress management, and social connection all influence the rate at which we age at a cellular level.
Measuring Your Biological Age
Epigenetic clocks such as the Horvath Clock and GrimAge are among the most validated tools available. Emerging consumer tests now offer accessible versions of these assessments. Forever Well incorporates biological age testing as a core part of its diagnostic framework.