In 2012, Andrew Oswald published an article in the Proceedings of the National Academy of Sciences of the USA arguing that, like humans, great apes have a tendency to U-shaped wellbeing through life.
ɪn tˈuː θˈaʊzənd twˈɛlv, ˈændɹuː ˈɑːswəld pˈʌblɪʃt ɐn ˈɑːɹɾɪkəl ɪnðə pɹəsˈiːdɪŋz ʌvðə nˈæʃənəl ɐkˈædəmi ʌv sˈaɪənsᵻz ʌvðə jˌuːˌɛsˈeɪ ˈɑːɹɡjuːɪŋ ðˈæt, lˈaɪk hjˈuːmənz, ɡɹˈeɪt ˈeɪps hæv ɐ tˈɛndənsi tə jˈuːʃˈeɪpt wˈɛlbiːɪŋ θɹuː lˈaɪf.