How the age calculator counts years, months and days
The age calculator first counts the whole years since your birthday, then the whole months since your last monthly anniversary, then the days left over. Months are not all the same length, so it uses the real calendar: someone born on January 31 is one month old on the last day of February. That is the same way birthdays, school entry ages and most legal ages work.
Your age in total days is the number of calendar days from your date of birth to the "Age on" date, not counting the day you were born. Hours are that number of days times 24, so they ignore the time you were born and daylight saving changes.
How old am I if I was born in…?
Your age in 2026 depends on whether your birthday has passed yet this year.
| Born in | Age before your 2026 birthday | Age after your 2026 birthday |
|---|---|---|
| 2021 | 4 | 5 |
| 2016 | 9 | 10 |
| 2011 | 14 | 15 |
| 2006 | 19 | 20 |
| 2001 | 24 | 25 |
| 1996 | 29 | 30 |
| 1991 | 34 | 35 |
| 1986 | 39 | 40 |
| 1981 | 44 | 45 |
| 1976 | 49 | 50 |
| 1971 | 54 | 55 |
| 1966 | 59 | 60 |
| 1961 | 64 | 65 |
| 1956 | 69 | 70 |
| 1951 | 74 | 75 |
| 1946 | 79 | 80 |
| 1941 | 84 | 85 |
Age milestones
Common US age limits: 16 for a driver's license in most states, 18 to vote, 21 to buy alcohol, 26 to stay on a parent's health insurance plan, 59½ for penalty-free withdrawals from most retirement accounts, 62 for the earliest Social Security retirement benefit, 65 for Medicare and 67 for full Social Security retirement age for anyone born in 1960 or later. In Australia, the Age Pension age is 67.
Frequently asked questions
How does the age calculator work?
Enter your date of birth. The age calculator counts the whole years since then, then the whole months, then the days left over, using the real length of each month. It also shows your age in total months, weeks, days and hours, and how many days until your next birthday.
How old am I?
Enter your date of birth in the age calculator above: it shows exactly how old you are today in years, months and days. To find your age on another date, for example on a form deadline, change the "Age on" date.
How is age calculated if I was born on February 29?
In years without a February 29, the calculator treats March 1 as your birthday, so you turn a year older on March 1. This matches the rule most US states and the UK use for legal ages. Some people celebrate on February 28 instead.
How do I calculate age in Excel or Google Sheets?
With the birth date in A1, use =DATEDIF(A1,TODAY(),"y") for whole years, =DATEDIF(A1,TODAY(),"ym") for the extra months and =DATEDIF(A1,TODAY(),"md") for the extra days. The age calculator here gives the same years and months.
Is this the same as chronological age?
Yes, chronological age is your age in years, months and days from your date of birth. Psychologists and teachers often need it for test scoring in a set format, so we have a separate chronological age calculator that also shows the 30-day hand method used in test manuals.
More date tools: add or subtract days, weeks, months or years, count the days since a date or make a countdown to any date.