Age Calculator
Free age calculator: exact age in years, months, days from date of birth. Compare ages, next birthday countdown, life stage, and generation.
Age Calculator
Calculator mode
When were you born?
Calculate age as of
How age is calculated
Age is computed using calendar date arithmetic: full years, then months, then days between your birth date and the comparison date. Leap years and varying month lengths are accounted for. This tool is for general use only; for official purposes consult the relevant authorities.
Use this free age calculator to find your exact age in years, months, and days from your date of birth. Whether you need to know how old you are today, how old you were on a past date, or how old you will be on a future date, the tool handles it all—including leap years and varying month lengths. You can also compare two people’s ages to see the exact age difference, check your next birthday countdown, discover your life stage, and find out what generation you belong to. No sign-up required, no data stored—everything runs privately in your browser.
How to Use Age Calculator
How to calculate your exact age from date of birth
Open the age calculator and enter your date of birth using the date picker. The tool instantly computes your chronological age in years, months, and days using calendar-accurate date arithmetic. Leap years, February 29 birthdays, and months of different lengths are all handled correctly.
How to calculate age as of a specific date
By default the calculator shows your age today. To find out how old you were—or will be—on another date, switch “Calculate age as of” to “Specific date” and pick any past or future date. This is useful for passport applications, school admission cut-off dates, insurance eligibility, or simply answering “how old will I be in 2030?”
How to compare two ages and find the age difference
Switch to “Compare ages” mode and enter two dates of birth. The calculator shows both people’s exact ages and the precise age difference in years, months, and days—perfect for couples, siblings, or friends who want to know their age gap.
How to read your results: birthday, life stage, and generation
After calculating, you see your exact age, your next birthday date and how many days until it, your life stage (e.g. Infant, Adolescent, Adult, Senior), and your generation (e.g. Baby Boomers, Gen X, Millennials, Gen Z, Gen Alpha). Use these insights for fun, social sharing, or quick age verification.
Calculator Features
Exact age in years, months, and days
Calculates precise chronological age using calendar date arithmetic—not simplified 365-day estimates. Every month length and leap year is accounted for.
Next birthday countdown
Shows the date of your next birthday and exactly how many days remain. Handles February 29 leap-day birthdays gracefully.
Age difference calculator
Compare two dates of birth side by side to see both ages and the exact gap in years, months, and days between them.
Life stage identification
Instantly see your life stage—Infant, Toddler, Preschooler, School Age, Adolescent, Young Adult, Adult, Middle Age, Pre-Senior, or Senior—with milestones for each.
Generation finder
Discover your generation (Silent Generation, Baby Boomers, Gen X, Millennials, Gen Z, or Gen Alpha) based on birth year, with traits and year ranges.
Calculate age as of any date
Find your age on a past or future date—useful for passport forms, visa applications, school admissions, insurance eligibility, and retirement planning.
Baby and newborn age
Works for any age, including newborns. Enter a recent birth date to see age in months and days—helpful for tracking baby milestones.
Private and free
All calculations run 100% in your browser. No birth dates or personal data are sent to any server. No sign-up, no ads, no tracking.
Complete Function List
- Exact age in years, months, and days from any date of birth:
- Calculate age as of today or as of any specific past/future date:
- Compare two people’s ages and show the exact age difference:
- Next birthday date with days-until countdown:
- Life stage classification with description and milestones:
- Generation identification (Silent Gen through Gen Alpha):
- Leap-year and February 29 birthday handling:
- Works for babies, children, adults, and seniors:
- Useful for passport, visa, school admission, and insurance forms:
- Mobile-friendly, responsive design:
- Accessible with keyboard navigation and screen readers:
- No account, no data stored, 100% browser-based:
Common Calculations & Examples
Example 1: How old am I today?
Problem: You were born on March 15, 1990, and want to know your exact age right now.
Steps:
- Enter your date of birth: 1990-03-15.
- Leave “Calculate age as of” set to Today.
- Read your age in years, months, and days.
Explanation: The calculator uses calendar date arithmetic so every month and every leap year is counted correctly—giving you a precise answer to “how old am I?”.
Example 2: How old will I be on a certain date?
Problem: You want to know your age on January 1, 2030 for a milestone celebration.
Steps:
- Enter your date of birth.
- Set “Calculate age as of” to Specific date and pick 2030-01-01.
- Read your future age.
Explanation: This answers “how old will I be in 2030” precisely, useful for retirement planning, milestone birthdays, or just curiosity.
Example 3: Calculate age for passport or school admission
Problem: A passport form asks for your age as of the travel date, or a school requires age as of September 1.
Steps:
- Enter the child’s or applicant’s date of birth.
- Set “Calculate age as of” to the required cut-off date (e.g. 2026-09-01).
- Read the exact age on that date.
Explanation: Many official forms require age as of a specific date. This calculator gives you the exact answer without manual counting.
Example 4: Age difference between two people
Problem: You and your partner want to know your exact age gap.
Steps:
- Switch to “Compare ages” mode.
- Enter the first person’s date of birth.
- Enter the second person’s date of birth.
- View both ages and the difference.
Explanation: The age difference calculator uses the same precise date arithmetic so the result is accurate to the day.
Example 5: Calculate a baby’s age in months and days
Problem: Your newborn was born on October 3, 2025, and a doctor asks how many months old the baby is.
Steps:
- Enter the baby’s date of birth: 2025-10-03.
- Leave “Calculate age as of” set to Today.
- Read the age in years, months, and days.
Explanation: The calculator works for any age, including newborns and infants, making it easy to track milestones like “how many weeks/months old is my baby?”.