The oldest baby boomers are turning 80 in 2026. This generation known as a cultural and political vanguard is now contributing to America's aging population. By the end of this decade, all baby boomers will be 65 or older. Driven by longer life spans and lower birth rates, the U.S. population will begin shrinking in five years without any immigration. During the baby boom from 1946 to 1964, about 76 million Americans were born. Now they're the second-largest age group and the influence of these octogenarians will continue to impact America's society and economics.