Age Difference Calculator

The age gap between two people is the calendar span from the older birth date to the younger one, expressed as years, months, and days — not a rounded decimal unless you convert manually. Comparing January 10, 1990 with March 15, 1995 shows Person B is younger by 5 years, 2 months, and 5 days with the default fields.

Order of entry affects the sign, not the magnitude. Person A born first yields a positive gap meaning A is older; swap the dates and the sign flips. Siblings, couples, and co-stars often quote gap in whole years socially, but months and days matter for fine-grained eligibility or trivia.

Leap years and month lengths use the same calendar-walk logic as the standalone age calculator. February 29 birthdays are valid inputs; the walk handles them without dividing by 365.

Common mistakes include comparing birth years only (two people both "born in 1990" can differ by 11 months), ignoring timezone for same-day hospital births in different zones (this tool is date-only), and using age gap for legal age-of-consent questions without checking jurisdiction-specific rules.

Pregnancy and due-date trivia sometimes quote age gaps between siblings in days — the signed total days row helps compare exact spans without converting to years first.

Twins born minutes apart show zero gap in calendar terms if same birth date — use time-of-birth elsewhere if minutes matter medically.

Historical figures with uncertain birth dates produce illustrative gaps only — genealogy records may disagree on the day.

Limits: entertainment and planning math only — not legal advice. Future birth dates produce numbers but are not meaningful for real people.