How to Find the Age Difference Between Dates
Calculate the age gap between two people or the duration between any two dates in years, months, and days, with worked examples and off-by-one mistakes.
Age in Days, Weeks, and Months Explained
How to convert age into total days, weeks, and months — with formulas, baby-age examples, and why dividing by 30 or 365 quietly gives the wrong answer.
Calculate Age in Excel, Python, and JavaScript
Copy-paste formulas and code to calculate age from a date of birth in Excel, Google Sheets, Python, and JavaScript, with the birthday edge case solved.
How to Calculate Age From Date of Birth
Learn how to calculate exact age from a date of birth in years, months, and days: the manual method, worked examples, leap-year rules, and a faster way.
Need Your Exact Age?
Calculate age in years, months, and days — plus total weeks, days, hours, and minutes, zodiac signs, and a birthday countdown.
Open Age Calculator