1-2. (conceptual-7) Which of the following is NOT an example of a potential shared, “age-
graded” change in adulthood?
a. a loss of fitness (e.g., aerobic capacity) beginning in the 30s and 40s and continuing
into old age
b. an increase in the frequency of contact with siblings between middle age and old age
*c. a higher average number of years of education among current 25-year-olds than
among current 65-year-olds
d. a greater susceptibility to disease among current 65-year-olds than among current 30-
year-olds
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