Final answer:
The proportion of people over 65 years old in the U.S. is expected to reach 25 percent of the population by 2030, leading to the "graying of America." This has important implications for public health.
Step-by-step explanation:
The demographic situation in the U.S. is characterized by an aging population, also known as the "graying of America." The proportion of people over 65 years old is expected to reach 25 percent of the population by 2030. This has significant implications for public health as it presents challenges and opportunities in healthcare and social policy.