How much age difference is acceptable in Japan?

In Japan, its 1.4 years (pdf). Thats a pattern seen around the world: Age gaps show up among heterosexual couples in every culture.

What is the average age difference between couples in Japan?

In contrast, the oldest average for both men and women was Tokyo, at 32.3 and 30.5, respectively. Among all marriages, 19.7% of men and 16.9% of women were remarrying .Average Age at First Marriage in Japan.HusbandWife201731.129.4201831.129.4201931.229.64 more rows•7 Jul 2020