Final answer:
The percentage of the population that older adults make up has increased over time.
Step-by-step explanation:
The percentage of the population that older adults make up has increased over time. In 1900, it was around 4 percent, in 1994 it was around 12 percent, and by 2016 it had grown to about 15 percent. This increase in the elderly population is often referred to as 'the graying of America.'