How age difference is measured
The age gap is calculated by comparing the earlier birth date against the later birth date using full calendar years, completed months and residual days.
The tool also references the half-your-age-plus-seven social guideline, which suggests a minimum conventional dating age of half the older person's age plus seven years.
Worked example
Comparing birth date 10 March 1992 and birth date 22 August 1996:
The exact chronological difference is 4 years, 5 months and 12 days (1,626 total days). Person 1 is older than Person 2.
Inputs for the age difference calculator
First person's birth date
The calendar date of birth of the first individual.
Second person's birth date
The calendar date of birth of the second individual.
CALCULATOR QUESTIONS
Age difference calculator questions
Does it matter which birth date is entered first?
No, the calculator automatically identifies who was born first and computes the positive difference.
What is the half-your-age-plus-seven rule?
It is a popular relationship age-gap rule of thumb defining the minimum socially accepted age partner as half your current age plus seven.