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U.S. fertility rate dropped to 1.62 in 2025 (record low), down from a 2007 peak…

2026-05-11 · 00:33 UTC ·@aakashgupta ·2 min read

Brief

The U.S. fertility rate fell to 1.62 in 2025, producing a generation ~23% smaller (2025 cohort ≈3.6 million). Fertility declines—including a 72% drop in teen births—persisted for 11 years post‑Great Recession. The author ties this structural demographic contraction to policy strains (Social Security) and $660–700B in 2026 AI capex by hyperscalers as firms price long‑term demand risk.

Why it matters

U.S. fertility rate dropped to 1.62 in 2025 (record low), down from a 2007 peak of 2.10; at 1.62 each generation is about 23% smaller and the 2025 birth cohort totals ~3.6 million (roughly equal to 1979 despite a much larger U.S. population).

Key details

  • Teen fertility fell from 41.5 births per 1,000 in 2007 to 11.7 in 2025 (a 72% decline); overall fertility declined for 11 consecutive years after the Great Recession, signaling a structural change not reversed by economic expansion.
  • Social Security trustees pushed the date the rate reaches 1.9 from 2040 to 2050 while the trust fund still exhausts in 2033; hyperscalers (Amazon, Microsoft, Google, Meta, Oracle) plan $660–700 billion in AI infrastructure capex in 2026 (≈double 2025), with capex at 45–57% of revenue, which the author frames as pricing demographic risk.
Source evidence

The U.S. fertility rate just hit 1.62 in 2025, the lowest on record. It peaked at 2.10 in 2007. Replacement is 2.1. The U.S. has cleared replacement once in 50 years.

This is the most important chart in American business and almost nobody prices it correctly.

1.62 means each generation runs 23% smaller than the one before it. The 2025 birth cohort numbers 3.6 million, roughly the same as 1979 against a U.S. population that has nearly doubled. The 2007 cohort enters prime working age in 2029. Every cohort behind it shrinks.

The Great Recession ended in June 2009. Fertility kept falling for 11 straight years through recovery, expansion, full employment, and $30 trillion of household wealth creation. The decline is structural. Teen fertility alone collapsed from 41.5 births per 1,000 in 2007 to 11.7 in 2025, a 72% drop. The largest behavior change in U.S. demographic history happened during the longest expansion in U.S. demographic history.

The Social Security trustees just pushed the date the rate reaches 1.9 back a full decade, from 2040 to 2050. They have stopped pricing a recovery. The trust fund exhausts in 2033 regardless.

Now place this chart next to AI capex.

Amazon, Microsoft, Google, Meta, and Oracle will spend $660 to $700 billion on AI infrastructure in 2026. Roughly double 2025. Capex now runs 45 to 57% of revenue at the hyperscalers, a ratio previously found only in utilities and steel.

AI capex is read as a bet on demand. The same capex is simultaneously a hedge against supply. The cohort entering the workforce in 2043 was born in 2025. There are 23% fewer of them than in 2007.

Korea sits at 0.72. Japan at 1.20. Italy at 1.18. The narrative of American demographic exceptionalism was always a math trick layered on top of native-born fertility that has been below replacement since 1972.

Housing prices, healthcare costs, K-12 enrollment, university solvency, military recruiting, church attendance, and Social Security all sit downstream of one line on one chart.

The hyperscalers just started pricing it. $700 billion is the price.