New research has found that humans age in two rapid bursts rather than in a gradual, chronological way.
Stanford University scientists have found that the number of molecules and microorganisms in the body dramatically fluctuates around the ages of 44 and 60.
Over a hundred adults between the ages of 25 and 75 were tracked as part of the study.
Michael Snyder is a geneticist at Stanford University who co-wrote the study.