Serious and well controlled research studies on aging have been available:
a. Only in the past 50 years
b. Since the turn of the 20th century
c. Following the Great Depression
d. Since the year 2000
ANS: A
Only in the past 50 years have serious and carefully controlled research studies flourished. Before that, anecdotal evidence was used to illustrate issues assumed to be universal, making all the remaining options incorrect.
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