Many human generations ago, most women worldwide began childbearing in their mid-teens. Today, a large proportion of women worldwide delay childbearing until their 20s. Among college-educated women in developed nations, the trend in delaying reproduction has been taken even further; childbearing often is delayed until past age 30 due to education and career pressures. Suppose that most women worldwide were to delay childbearing until age 30, and that women were to continue to make this choice for many human generations. Make a prediction about how human life span and fertility might evolve in response.
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