Use this chronological age calculator (DOB calculator) to instantly find out how old you are in years, months, and days from your date of birth — plus see how many days until your next birthday.
Chronological age is the total time that has passed since a person was born, measured in years, months, and days. Unlike biological or psychological age, which can vary based on health and lifestyle, chronological age is strictly based on the calendar and the date of birth.
The present age formula measures the difference between the current date and the date of birth, expressed in years, months, and days. The calculation considers whether the current month or day has passed relative to the birth month or day.
Mathematically, the present age formula can be expressed as:
Years = Current Year − Birth YearMonths = Current Month − Birth MonthDays = Current Day − Birth DayDays < 0, subtract 1 from months and add the number of days in the previous month.Months < 0, subtract 1 from years and add 12 to months.Suppose a person was born on 15 January 2000 and today's date is 20 February 2026:
This method ensures your age is accurate to the day and accounts for the differences in months and leap years automatically.
Wondering how old you are if you were born in a specific year? Or how old is someone who was born in a certain year? The table below shows the age a person turns in 2026 based on their birth year. Note: if your birthday hasn't occurred yet in 2026, you'll be one year younger than shown until that date.
| Birth Year | Age in 2026 | Generation |
|---|---|---|
| 2010 | 15 or 16 | Generation Z |
| 2009 | 16 or 17 | Generation Z |
| 2008 | 17 or 18 | Generation Z |
| 2007 | 18 or 19 | Generation Z |
| 2006 | 19 or 20 | Generation Z |
| 2005 | 20 or 21 | Generation Z |
| 2004 | 21 or 22 | Generation Z |
| 2003 | 22 or 23 | Generation Z |
| 2002 | 23 or 24 | Generation Z |
| 2001 | 24 or 25 | Generation Z |
| 2000 | 25 or 26 ⭐ | Generation Z |
| 1999 | 26 or 27 | Millennials |
| 1998 | 27 or 28 | Millennials |
| 1997 | 28 or 29 | Millennials |
| 1996 | 29 or 30 | Millennials |
| 1995 | 30 or 31 | Millennials |
| 1994 | 31 or 32 | Millennials |
| 1993 | 32 or 33 | Millennials |
| 1992 | 33 or 34 | Millennials |
| 1991 | 34 or 35 | Millennials |
| 1990 | 35 or 36 | Millennials |
| 1985 | 40 or 41 | Millennials |
| 1980 | 45 or 46 | Generation X |
| 1975 | 50 or 51 | Generation X |
| 1970 | 55 or 56 | Generation X |
| 1965 | 60 or 61 | Baby Boomers |
| 1960 | 65 or 66 | Baby Boomers |
| 1955 | 70 or 71 | Baby Boomers |
| 1950 | 75 or 76 | Silent Generation |
| 1945 | 80 or 81 | Silent Generation |
| 1940 | 85 or 86 | Silent Generation |
⭐ = Milestone birth year. Ages shown as a range because your exact age depends on whether your birthday has passed yet in 2026. Use the calculator above for your precise age.
If you know the month of birth, the table below is a quick reference for anyone born in that month. It shows their zodiac sign, their age turning in 2026 (for someone born in 2000), and approximately how many days until the next birthday from March 2026. Use the birthday calendar below to find your birth month at a glance.
| Birth Month | Zodiac Sign | Age in 2026 (born 2000) | Approx. Days Until Next Birthday (from Mar 2026) |
|---|---|---|---|
| Birth in January | Capricorn / Aquarius | 26 (birthday passed) | ~305 days |
| Birth in February | Aquarius / Pisces | 26 (birthday passed) | ~335 days |
| Birth in March ⭐ | Pisces / Aries | 25 or 26 | ~0–30 days |
| Birth in April | Aries / Taurus | 25 (not yet turned 26) | ~30 days |
| Birth in May | Taurus / Gemini | 25 (not yet turned 26) | ~60 days |
| Birth in June | Gemini / Cancer | 25 (not yet turned 26) | ~90 days |
| Birth in July | Cancer / Leo | 25 (not yet turned 26) | ~120 days |
| Birth in August | Leo / Virgo | 25 (not yet turned 26) | ~150 days |
| Birth in September | Virgo / Libra | 25 (not yet turned 26) | ~180 days |
| Birth in October | Libra / Scorpio | 25 (not yet turned 26) | ~210 days |
| Birth in November | Scorpio / Sagittarius | 25 (not yet turned 26) | ~240 days |
| Birth in December | Sagittarius / Capricorn | 25 (not yet turned 26) | ~270 days |
⭐ = Current month (March 2026). Ages shown are for someone born in 2000. Days until birthday are approximate from early March 2026. Use the calculator above for your exact countdown.
Calculating age precisely is important in various fields such as healthcare, education, legal documentation, and personal planning. Knowing the exact age in years, months, and days can help determine eligibility, plan events, or understand developmental milestones accurately.
The chronological age calculator works by subtracting the date of birth from the current date using the present age formula. It calculates the difference in years, months, and days while adjusting for negative values and accounting for varying month lengths and leap years. This ensures the result reflects the exact age as of the selected date.
To find out how old you are, simply enter your date of birth into our free age calculator above and click "Calculate Age." The tool will instantly show your exact age in years, months, and days as of today — no manual math required.
Our age calculator also tells you how many days until your next birthday. After entering your date of birth and clicking Calculate, the results section shows a countdown so you always know exactly how many days until your special day. Great for planning ahead!
How old you are if you were born in a given year depends on whether your birthday has already passed in the current year. For example, if you were born in 1995, you turn 31 in 2026 — but if your birthday hasn't occurred yet, you're still 30. Use the birth year table above or the calculator for an exact answer.
How old someone is who was born in any year is easy to check with our calculator. How old is someone born in 1990? They are 35 or 36 in 2026. How old is someone in 2026 who was born in 2000? They are 25 or 26. See the full reference table above for a quick lookup by birth year.
The present age formula is: Age = Current Date − Date of Birth. The result is broken down into years, months, and days. If the current day is less than the birth day, one month is borrowed from the month count. If the current month is less than the birth month, one year is borrowed. This formula is what our DOB calculator uses to give you a precise result.
Our birthday calendar reference table (shown above) lists all 12 birth months alongside the corresponding zodiac sign, approximate age in 2026, and days until the next birthday. It's a handy quick-reference for anyone wanting to look up birth month details without entering a full date into the calculator.
Yes, the calculator properly accounts for leap years, including February 29 birthdays. When implemented programmatically, it adjusts for the extra day in leap years to provide precise age calculations without errors.
Yes, age can be calculated for any reference date, not just today. By changing the comparison date, you can determine how old someone was on a past date or how old they will be on a future date.
Chronological age measures the exact time since birth based on calendar dates. Biological age, on the other hand, reflects physical health and body condition, which may differ from chronological age due to lifestyle, genetics, and medical factors.
Accurate age calculation is important for legal documentation, school admissions, healthcare eligibility, retirement planning, and many official applications. Even a small difference in days or months can affect eligibility requirements in certain situations.