Apes found to have 'midlife crises,' too

November 19, 2012 | 3:29 p.m. CST
In this Feb. 1, 2011, file photo, chimpanzees sit in an enclosure at the Chimpanzee Eden rehabilitation center, near Nelspruit, South Africa. A study of chimps and orangutans released Monday finds the same pattern of changes in happiness through life as many studies find in people.

RELATED STORIES: Even apes have 'midlife crises,' study finds