MADISON (WKOW)-- It's not just humans that go through mid-life crises.
The Journal of Proceedings of the National Academy of Sciences says, chimpanzees and orangutans do too. An internal study found they have the same U-shaped curve of happiness linked to mid-life crisis in humans.
The study found chimps and orangutans were happiest when young, and in old age, but their happiness took a dip in the middle of their lives.
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