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🕒 Chronological Age: Enter your date of birth and click Calculate to get your exact age in years, months, and days — plus useful aggregates (total days, weeks, months and decimal years).
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Chronological age is the exact time elapsed since your date of birth — measured in completed years, months, and days. It is the standard age used by schools, government forms, exams, and legal documents.
Use chronological age for admissions, eligibility checks, official documents, and legal forms. For medical or developmental evaluations you may sometimes use decimal age (years expressed as a decimal) or corrected age for premature infants.
This calculator uses calendar-aware arithmetic (month lengths and leap years) and provides both granular (y/m/d) and aggregate (days, weeks, months, decimal years) metrics.
Common questions about calculating age
Yes. The calculations use calendar-aware date math and account for leap years.
Decimal age is total days alive divided by 365.25 — useful in some medical and research contexts.
Yes. The exact years/months/days output is precise for cutoff-based eligibility checks.
Chronological age is the time elapsed since birth expressed in completed years, months and days. It is the standard measure used in official documents, admissions, legal paperwork and exam eligibility checks.
Calculations use exact calendar arithmetic: we subtract full years, then full months, then remaining days, accounting for different month lengths and leap years. This ensures the result is precise and reliable.