Last updated
Why Use the Age Calculator
- Exact precision — years, months, days, hours, minutes, and seconds
- Handles leap day birthdays correctly
- Future and past date support — calculate age on any date
- Next birthday countdown — days until the next birthday
- Eligibility checking — verify age requirements with exact precision
Whether you are building age verification into an application, tracking infant development milestones, or planning for retirement, the Age Calculator at TechConverter.me gives you precise results for any date combination.
Examples
Example 1: Basic Age Calculation
Birth date: March 15, 1990
Target date: March 17, 2026 (today)
Result:
Age: 36 years, 0 months, 2 days
Total days lived: 13,151 days
Next birthday: March 15, 2027 (363 days away)Example 2: Infant Age in Months (Medical Context)
Pediatricians track infant development in months, not years. A child born on October 5, 2024:
Birth date: October 5, 2024
Target date: March 17, 2026
Result:
Age: 1 year, 5 months, 12 days
Age in months: 17 months
Age in weeks: 76 weeksAt 17 months, the pediatrician can check developmental milestones appropriate for that age range. Medication dosing for children is also often based on age in months for infants under 2 years.
Example 3: Leap Day Birthday (February 29)
People born on February 29 have a special case — their birthday only exists in leap years:
Birth date: February 29, 2000
Target date: February 28, 2025 (non-leap year)
Result:
Age: 24 years, 11 months, 30 days
Note: Birthday celebrated on Feb 28 in non-leap years
(or March 1, depending on jurisdiction)
Target date: February 29, 2024 (leap year)
Result:
Age: 24 years, 0 months, 0 days — exact birthday!