1: Photo used under Creative Commons license.
2: Photo used under Creative Commons license.
3: Figure drawn by Dan Piraro, based on S. L. Armstrong, L. R. Gleitman, and H. Gleitman, “What Some Concepts Might Not Be,” Cognition 13, no. 3 (1983): 263–208.
4: Image courtesy of James Adams.
5: Figure adapted from A. Fiske, J. L. Wetherell, and M. Gatz, “Depression in Older Adults,” Annual Review of Clinical Psychology 5 (2009): 363–389.
6: Photos used under Creative Commons license.
7: Figure redrawn by Lindsay Fleming, from M. C. Bushnell, M. Čeko, and L. A. Low, “Cognitive and Emotional Control of Pain and Its Disruption in Chronic Pain,” Nature Reviews Neuroscience 14, no. 7 (2013): 502.
8: Photos used under Creative Commons license.
9: Figure drawn by Lindsay Fleming, based on S. Hood and S. Amir, “The Aging Clock: Circadian Rhythms and Later Life,” Journal of Clinical Investigation 127, no. 2 (2017): 437–446.
10: Figure redrawn by Lindsay Fleming, from S. G. Wannamethee, A. G. Shaper, and M. Walker, “Changes in Physical Activity, Mortality, and Incidence of Coronary Heart Disease in Older Men,” Lancet 351, no. 9116 (1998): 1603–1608.
11: Figure redrawn by Lindsay Fleming, from E. Dolgin, “There’s No Limit to Longevity, Says Study That Revives Human Lifespan Debate,” Nature (2018), https://www.nature.com/articles/d41586-018-055823.
12: Figure redrawn by Lindsay Fleming, from A. A. Stone et al., “A Snapshot of the Age Distribution of Psychological Well-Being in the United States,” Proceedings of the National Academy of Sciences 107, no. 22 (2010): 9985–9990.
All other images and figures are either in the public domain or were drawn by Dan Levitin and Lindsay Fleming, © 2020 by Daniel J. Levitin.