chronological age

How old are you really? Chronological age is easy -- count forward from birth. But establishing physiological age is purely subjective, based on how someone looks, feels and functions.

Research in nematode worms is providing a crucial first step toward the development of biomarkers to predict chronological and physiological age in humans.

This technology could facilitate testing of anti-aging therapies as well as give physicians a means of tracking how individuals "withstand the tests of time."

Age at menopause may now be predicted more realistically according to a new study. The study revealed that anti-Müllerian hormone (AMH) levels are related to the onset of menopause and are able to specify a woman's reproductive age more accurately than chronological age alone.

The levels of AMH in the blood reflect the number of small follicles present in a woman's ovaries. This follicle stock enables reproduction by ensuring monthly ovulations.