Age Difference Calculator
Exact age gap between two birthdays in years, months, days, weeks, and hours. Includes the popular "half your age plus seven" social rule check.
LIFESTYLEExact age gap between two people in years, months, days, weeks, and hours, plus a check against the "half your age plus seven" social rule (the lower bound of socially acceptable younger-partner age in Western dating culture).
The Y/M/D decomposition walks calendar months individually to avoid the off-by-one errors that simple (end - start) / 365.25 calculations produce. The "half your age plus seven" rule (younger partner minimum age = older partner age / 2 + 7) is a cultural heuristic that first appeared in print in 1901; it has no scientific basis but is widely cited in dating discussions and TikTok content.