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Japan’s 18-Year-Olds Hold at 1.09 Million, Second-Lowest on Record

The latest government estimate underscores a continuing low-birthrate trend.

Overview

  • The new-adult cohort accounts for 0.89% of the population, a 0.01-point increase from last year.
  • The 18-year-old group comprises roughly 560,000 males and 530,000 females.
  • Only the 2024 cohort was smaller at 1.06 million in records that date back to 1968.
  • People born in the Year of the Horse total 9.40 million, the fewest among the twelve zodiac groups.
  • For historical comparison, the number of new adults peaked at 2.46 million in 1970 during the first postwar baby boom.