1. Marcia K. Goin, “Emotional Survival and the Aging Body,” in New Dimensions in Adult Development, ed. Robert Nemiroff and Calvin Colarusso (New York: Basic Books, 1990), pp. 518–531, p. 524.
2. Carl Eisdorfer and Robert Raskind, “Aging and Human Behavior,” in Hormonal Correlates of Behavior, Vol. 1. A Lifespan View, ed. B. E. Eleftreriois and R. L. Spatts (New York: Plenum Press, 1975), pp. 369–387, p. 380.
3. William Masters and Virginia Johnson, Human Sexual Response (Boston: Little, Brown, 1966), pp. 241–242.
4. Ibid., pp. 203–204.
5. David Wechsler, “Intellectual Changes With Age,” in Mental Health in Later Maturity (Supplement 168, Federal Security Agency: U.S. Public Health Service, 1941), p. 46.