A biomarker is a biological characteristic that is objectively measured and evaluated as an indicator of normal biological or pathological processes, or a response to a therapeutic intervention.

Although age is the principal risk factor for several chronic diseases, it is an unreliable indicator of how quickly ... and your biological age – your physical and functional ability.

your nails might be able to shed some light on your biological age. Speaking on an episode of his podcast Lifespan, he said "the rate of your nail growth is a really good indicator of how you're ...