Evidence for a midlife crisis in great apes

Evidence for a midlife crisis in great apes consistent with the U-shape in human well-being

When humans in midlife reside,
We oft feel a bit off our stride
But it’s not our society
That brings this anxiety:
It’s just that we’re great apes inside.

Alexander Weiss, James E. King, Miho Inoue-Murayama, Tetsuro Matsuzawa, and Andrew J. Oswald.
Evidence for a midlife crisis in great apes consistent with the U-shape in human well-being.
PNAS 2012 : 1212592109v1-201212592.

(Note: Why did all the media coverage of this talk about men and male apes when the article emphasizes that sex is not a factor?)