From the U.S. Census:
The U.S. Census Bureau today released a downloadable file containing estimates of the nation’s resident population by sex and single year of age for July 1, 2021.
In the coming months, the Census Bureau will release additional population estimates for cities and towns, as well as national, state and county population estimates by age, sex, race and Hispanic origin.
Direct to Data File
Learn More: Adapting Population Estimates to Address COVID-19 Impacts on Data Availability