In midlife, adults are more likely to choose friends who are different from them in age and gender.

Midlife

A period in an adult's life, often between the ages of 40 and 65, marked by personal, professional, and familial transitions and reflections.

Age

A measure of the amount of time an individual or object has existed from a particular starting point, typically measured in years.

Gender

The adoption of characteristics associated with men and women; acquired through socialization.