Age Calculator
Why Use Our Age Calculator?
Instant Results
Your age is calculated automatically the moment you select a date — no button to click.
Years, Months & Days
Get a precise breakdown of your age, not just the year count.
Year & Month Navigation
Jump directly to any year from 1900 to the present using the calendar dropdowns.
Works on Any Device
Fully responsive — works on desktop, tablet, and mobile without any installation.
How to Calculate Your Age
- 1
Open the Date Picker
Click the "Pick a date" button above to open the calendar.
- 2
Navigate to Your Birth Year
Use the year and month dropdowns at the top of the calendar to jump directly to your birth year.
- 3
Select Your Date of Birth
Click the exact day you were born to set your full date of birth.
- 4
See Your Exact Age
Your age in years, months, and days is calculated instantly — no button press needed.
Notable Age Milestones
| Age | Significance |
|---|---|
| 18 years | Legal adulthood in most countries |
| 21 years | Full legal rights in the US (e.g., alcohol) |
| 25 years | Prefrontal cortex fully developed |
| 40 years | Commonly considered middle age |
| 60 years | Senior discounts begin in many countries |
| 65 years | Traditional retirement age (US) |
| 67 years | Full Social Security retirement age (born after 1960) |
| 100 years | Centenarian — receives a letter from the US President |
Common Uses for an Age Calculator
Legal & Official Forms
Confirm your exact age for government forms, ID applications, and legal documents.
Medical & Health
Provide an accurate age for doctor visits, insurance forms, and health screenings.
Milestone Birthdays
Find out exactly how many years, months, and days until a milestone birthday.
Age Differences
Quickly compare ages between two people by calculating each one separately.
Historical Events
Find out how old a person was at a historic event by entering their birth year.
Fun & Trivia
Discover your age in precise days or check how close you are to your next birthday.
Frequently Asked Questions
How is my age calculated?▼
Your age is calculated by finding the difference between your date of birth and today's date. The result is broken down into full years, remaining months, and remaining days — giving you a precise picture of your exact age.
Does this age calculator account for leap years?▼
Yes. The calculator uses the date-fns library, which correctly handles leap years (e.g., February 29 birthdays), ensuring your age in days is always accurate.
What is the earliest date I can enter?▼
The calculator supports dates from January 1, 1900 onwards, covering virtually all real-world use cases including historical research.
Can I use this to find the age of something other than a person?▼
Absolutely. Enter any past start date — a company founding, a pet's birthday, a wedding anniversary, or a historical event — to calculate how much time has passed.
Why doesn't the calculator accept future dates?▼
Age is defined as the time elapsed from a past date to today. Future dates would yield a negative result, which is not a meaningful age. To measure time until a future event, use our Countdown Timer.
How do I calculate my age on a specific date (not today)?▼
This tool calculates age up to today. To find the difference between any two custom dates — for example, how old you were on your wedding day — use our Date Difference Calculator.