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{{Short description|Total number of living humans on Earth}} ...obabilistic/POP/TOT/900 |access-date= |publisher=United Nations Department of Economic and Social Affairs, Population Division}}</ref>]] ...

...ort description|Archaeological record of human activity determined by rate of mutation in mitochondrial genome}} ...ld then be used to confidently date events that occurred during the course of human evolution. ...

...t N. Butler 2004.jpg|thumb|upright|[[Robert N. Butler]], founding director of the [[National Institute on Aging]] who coined the term "ageism"]]{{Discrim ...Stereotyping and Prejudice Against Older Persons. Massachusetts Institute of Technology, 2002</ref><ref name="Karlsson" /> ...