Sciences 10 (2006): 132; R. S. N. Liu et al., “A
Longitudinal Study of Brain Morphometrics Using
Quantitative Magentic Resonance Imaging and
DifferenceImageAnalysis,”NeuroImage 20 (2003):26;
T. A. Salthouse, “Aging and Measures of Processing
Speed,” Biological Psychology 54 (2000): 37; D. A.
Evans et al.,“Prevalence of Alzheimer’s Disease in a
Community Population of Older Persons,” JAMA 262
(1989): 2251.
31 Why we age: R. E. Ricklefs, “Evolutionary
Theories of Aging: Confirmation of a Fundamental
Prediction,with ImplicationsfortheGenetic Basisand
Evolution of Life Span,” American Naturalist 152
(1998):24–44;R.M.Zammuto,“LifeHistoriesofBirds:
Clutch Size, Longevity, and Body Mass among North
AmericanGameBirds,”CanadianJournalofZoology 64
(1986): 2739–49.
32 Theideathatlivingthingsshutdown:C.Mobbs,
“MolecularandBiologicFactorsinAging,”inGeriatric
Medicine,ed.Cassel;L.A.GavrilovandN.S.Gavrilova,
“Evolutionary Theories of Aging and Longevity,”
Scientific World Journal2 (2002): 346.
32 average life span of human beings: S. J.
Olshansky, “The Demography of Aging,” in Geriatric
Medicine,ed. Cassel; Kellehear,A Social History.
32 AsMontaignewrote:MicheldeMontaigne.The
Essays,sel.anded.AdolpheCohn(G.P.Putnam’sSons,
1907), p. 278.
33 inheritance has surprisingly little influence:G.
Kolata,“Live Long?Die Young?Answer Isn’t Justin