The U.S. Census Bureau recently released 2025 Detailed Population Estimates, which show shifting demographic makeups of the country, largely driven by the continued transition of baby boomers into retirement age, local migration, and fertility patterns. Nationally, our country’s senior population, aged 65 and up, has grown by 16.2% from 2020 to 2025. This is notably over 10 percentage points higher than the next highest growing population group, those aged from 25-44 (+5.9%). On the other end of the spectrum, the population under age 18 has declined by 2.4% from 2020 to 2025. There were small gains in the 18-24 population range (+2.1%) and small losses in the 45-64 age range (-3.2%). 

The Pennsylvania State Data Center created a report on this data for the Commonwealth. Of note, the state’s older population also continued to grow from 2020 to 2025. Pennsylvanians aged 65 and older increased by 13%, mirroring national trends in the baby boomer generation. In 2025, 21 percent of the population in Pennsylvania was 65 years of age or older. Pennsylvania also experienced growth in the middle-aged population (35 to 39: +7.1% and 40 to 44: +9.1%), again keeping in line with national trends. Overall, the population under 25 decreased by -3.0%. For every 10 individuals under age 25 lost in Pennsylvania since 2020, the state gained 27 persons aged 65 or older.