RT Book, Section A1 de Cabo, Rafael A1 Le Couteur, David A2 Loscalzo, Joseph A2 Fauci, Anthony A2 Kasper, Dennis A2 Hauser, Stephen A2 Longo, Dan A2 Jameson, J. Larry SR Print(0) ID 1190512971 T1 Biology of Aging T2 Harrison's Principles of Internal Medicine, 21e YR 2022 FD 2022 PB McGraw-Hill Education PP New York, NY SN 9781264268504 LK accessmedicine.mhmedical.com/content.aspx?aid=1190512971 RD 2024/04/16 AB The dramatic increase in the population of older people is one of the most significant changes in human history. In the past few years, the number of people over the age of 65 exceeded that of children under the age of 5 for the first time, and by 2050, older people will likely outnumber children under the age of 14 (Fig. 476-1).