Age Calculator
Find your exact age in years, months, and days. See when your next birthday is.
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Reviewed by
Priya SharmaCultural Historian
How Age Is Calculated
Age calculation follows the Gregorian calendar''s birthday rule: you gain a year of age on the same calendar date as your birth in each subsequent year. The calculator tracks the precise difference by counting completed years, then remaining months, then remaining days — never approximating with 365-day averages.
For example, someone born on October 15, 1990 is exactly 35 years, 5 months, and 1 day old on March 16, 2026 — not simply 35.42 years. The day-precise breakdown matters for legal and medical contexts where exact age at a specific date is required.
Notable Age Milestones
Minimum working age in many countries; driving license eligibility in the UK and US
Legal adulthood in most of the world; voting age in UK, US, EU, and Australia
Legal drinking age in the United States; full legal capacity in some jurisdictions
Car rental preferred rate threshold; prefrontal cortex fully developed (neuroscience)
Standard state pension eligibility age in most OECD countries
Centenarian — as of 2026, there are approximately 722,000 centenarians worldwide
Age Reckoning Around the World
Western (International Standard)
Age starts at 0 at birth. You turn 1 on your first birthday, 2 on your second, and so on. This is the method used by this calculator and adopted as the global standard.
Traditional East Asian (세는 나이)
Used historically in China, Japan, and Korea: everyone is born age 1, and gains a year on each Lunar New Year — not on their birthday. A baby born on December 31 is considered age 2 just two days later on January 1. South Korea officially discontinued this system in 2023 in favor of the international standard.
Nomimal (Korean) Age
A simplified variant of the East Asian system: everyone gains a year on January 1. Age = current year − birth year (+ 1 before birthday in some interpretations). Also deprecated in South Korea as of June 2023.