Apes go through midlife crises just like humans do.

A team of British scientists assembled data on more than 500 great apes from zoos and research centers in the US, Australia, Canada, Singapore and Japan.

Caretakers and other observers had filled out a four-item questionnaire to assess the well-being in the apes.

The questions asked such things as the degree to which each animal was in a positive or negative mood, how much pleasure it got from social situations, and how successful it was in achieving goals.

The report says that captive chimps and orangutans do show the same low ebb in emotional well-being at midlife that some studies find in people.

All this meaning that the midlife crisis largely stems from biological changes living beings go through. 

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