From a Wall Street Journal story by Clare Ansberry headlined “The Age When You Stop Feeling Young”:

Millennials are starting to feel old.

The first members of the millennial generation, often classified as those born between about 1980 and 1996, begin to turn 43 this year. It’s the average age when Americans stop feeling young, according to a study by Worldwide Independent Network of Market Research.

The early 40s—specifically 42—is when the average American starts noticing physical signs of aging, including achy joints and gray hair, according to a September poll conducted on behalf of Found, a weight-management company.