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America has a missing-middle problem — and this one is demographic.
Why it matters: The shrinking 45-64 population could leave fewer experienced adults to run institutions, mentor younger workers and care for the fast-growing population behind them.
By the numbers: The U.S. population ages 45-64 fell by 2.68 million from April 1, 2020, to July 1, 2025, according to new Census Bureau population estimates reviewed by Axios.









