"In 2035, senior citizens will outnumber children under 18 for the first time in the history of the U.S.A." That statement is True, based on projections from the U.S. Census Bureau. According to the U.S. Census Bureau's 2017 National Population Projections: Year of Shift: The year when this demographic milestone is projected to occur is 2034 (an earlier revision had it at 2035). The Numbers: In that year, the population aged 65 and over is projected to surpass the population under the age of 18 for the first time in U.S. history. The Cause: This shift is primarily driven by the aging of the large Baby Boomer generation (born 1946–1964) combined with lower birth rates. The aging of the U.S. population is considered one of the most significant demographic transformations in the country's history.