How do I calculate my exact age?

Enter your date of birth in the age calculator. It shows your precise age in years, months, and days as of today, or any date you set in the ''Age at Date'' field.

How many days have I been alive?

The age calculator displays your total days lived alongside your age. For example, a 30-year-old has lived approximately 10,957 days. A 25-year-old has lived about 9,131 days.

What day of the week was I born on?

The calculator automatically shows the day of the week for your date of birth. Enter your birthdate and look for the ''Born on Day of Week'' result row.

How many days until my next birthday?

The age calculator shows both your next birthday date and the exact number of days remaining. It updates automatically based on today''s date.

Can I calculate how old someone will be on a future date?

Yes. Enter any date of birth and change the ''Age at Date'' field to a future date. The calculator shows exactly how old that person will be on the chosen date.

How old am I if I was born in 1990?

If you were born in 1990, you are 35 years old in 2026 (or 34 if your birthday hasn''t occurred yet this year). Use the age calculator to get the precise answer in years, months, and days.

How is age calculated for someone born on February 29?

People born on February 29 (leap day) officially turn a year older on February 28 in non-leap years in most countries. The calculator follows the standard convention of using February 28 as the birthday in common years.

What is the difference between Western age and East Asian age reckoning?

Western age counts completed years since birth — you are 0 at birth and turn 1 on your first birthday. Traditional East Asian age reckoning (used historically in China, Japan, and Korea) starts at age 1 at birth and adds a year on each Lunar New Year. South Korea officially adopted the international standard in 2023.

How do I calculate my age in months?

The age calculator shows your age broken down into years, months, and days. For example, if you are 25 years, 6 months, and 15 days old, you are approximately 306 months old. Use the ''total days'' result divided by 30.44 for an approximate month count.

Age Calculator

Find your exact age in years, months, and days. See when your next birthday is.

Date of Birth

Age at Date (default: today)

Related Tools

Date Difference Countdown

Reviewed by

Priya Sharma

Calendar Systems & Cultural Time Expert

· MA Cultural Anthropology, Oxford· Research Fellow, Time & Culture Institute· Author of 'The Global Calendar' (2022)

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

16 years

Minimum working age in many countries; driving license eligibility in the UK and US

18 years

Legal adulthood in most of the world; voting age in UK, US, EU, and Australia

21 years

Legal drinking age in the United States; full legal capacity in some jurisdictions

25 years

Car rental preferred rate threshold; prefrontal cortex fully developed (neuroscience)

65–67 years

Standard state pension eligibility age in most OECD countries

100 years

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.