Final answer:
People over 65 have become one of the largest growing segments of the U.S. population, often referred to as the 'graying of America' due to factors like increased life expectancy and the aging of the Baby Boomers.
Step-by-step explanation:
The correct answer to the question regarding the growth of segments in the U.S. population is that people over 65 have become one of the largest growing segments of the U.S. population. This is supported by demographic evidence that shows a significant increase in the proportion of elderly people in the total U.S. population. The phenomenon, known as the "graying of America," is driven by multiple factors, including increased life expectancy and the aging of the Baby Boomer generation. Indeed, the elderly population has grown more than tenfold, whereas the total and under-sixty-five populations have only tripled. By 2030, all Baby Boomers will be aged 65 and older, further expanding this segment of the population.