Look up yakudoshi
From birth date and sex, we flag yakudoshi (mae / hon / ato) on kazoedoshi. This is custom, not legal age.
Date of birth
Gregorian
Japanese era
Year
Month
Day
As-of date
Year
Month
Day
Sex
Male
Female
Result
Kazoedoshi
42years
Yakudoshi
Hon-yaku・Taiyaku（Hon-yaku42years）
Yakudoshi is a shrine and regional custom, not legal age.
Yakudoshi on kazoedoshi
Typical hon-yaku: men 25, 42, 61; women 19, 33, 37, 61 (kazoedoshi). Taiyaku is often 42 for men and 33 for women.
Frequently asked questions
Does it always apply?
No. It is a shrine and regional custom, for reference only.