Behringer , V.; Stevens, J. M. G.; Deschner, T.; Sonnweber, R.; Hohmann, G.: Aging and sex affect soluble alpha klotho levels in bonobos and chimpanzees. Frontiers in Zoology 15, 35 (2018)
Scientists studying a rare population of tool-using chimpanzees have found that aging can have a profound impact on their abilities—but not all chimps decline equally.