Baltes, P. B. & Mayer, K. U. (1999). The Berlin aging study, aging from 70 to 100. Cambridge: Cambridge University Press. Baltes, P. B. & Mayer, K. U. (1999). The Berlin aging study, aging from 70 to 100. Cambridge: Cambridge University Press. 1gr3yl0ck2013-03-30T20:34:06+00:00