For many, middle age is associated with midlife crises and internal tumult. According to new research, it is also when the human body undergoes two dramatic bouts of rapid physical transformation on a molecular level.
In a new study, scientists at Stanford University tracked age-related changes in over 135,000 types of molecules and microbes, sampled from over 100 adults. They discovered that shifts in their abundance — either increasing or decreasing in number — did not occur gradually over time, but clustered around two ages.
“Obviously you change throughout your entire life. But there are two major periods when there are lots of changes: One is when people hit their mid-40s, and one is they hit their 60s,” said Michael Snyder, a geneticist at Stanford University who co-wrote the study, in a phone interview. On average, the changes clustered around the ages of 44 and 60.
Delusions of Adequacy 