How old am I if I was born in 1900? — the details
Everyone born in 1900 turns 126 at some point in 2026. That means people born in 1900 are currently either 125 or 126 years old, depending on whether their birthday has already arrived. On January 1, 2026 every person born in 1900 was 125; by December 31, 2026they are all 126.
- Generation
- Greatest Generation
- 1900–1900
- Chinese zodiac
- Rat
- Year of the Rat
- 1900 begins on a
- Monday
- Monday ends the year
- Leap year
- No — 365 days
- 1900 has no February 29
How old would I be if I was born in 1900? — milestone ages
| Milestone | Turning | In the year |
|---|---|---|
| Legal adult | 18 | 1918 (already passed) |
| Drinking age (US) | 21 | 1921 (already passed) |
| Turning 25 | 25 | 1925 (already passed) |
| Turning 30 | 30 | 1930 (already passed) |
| Turning 40 | 40 | 1940 (already passed) |
| Turning 50 | 50 | 1950 (already passed) |
| Turning 60 | 60 | 1960 (already passed) |
| Retirement | 65 | 1965 (already passed) |
| Turning 126 | 126 | 2026 — this year |
The exact math
Your age is simply today's year − birth year, minus one if this year's birthday hasn't happened yet:
- 1901 − 1900 = 1 → they turn 1 during 1901.
- 1918 − 1900 = 18 → legal adulthood arrives in 1918.
- In 2027 they will turn 127.
For an answer exact to the second — including months, days, hours and minutes — use the calculator above, or compare ages with family and friends on our Compare Ages page.
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FAQ — If I was born in 1900
Common questions about being born in 1900
If I was born in 1900, how old am I in 2026?
If you were born in 1900, you are 125 years old if your birthday has not happened yet this year, or 126 if it has — as of 2026. Everyone born in 1900 turns 126 during 2026. Use the exact age calculator above to get your precise age in years, months and days. On January 1, 2026 you were 125; by December 31, 2026 you are 126. Your exact age today depends only on whether your birthday in 2026 has passed.
How old would I be if I was born in 1900 — exact today?
You would be 126 after your birthday in 2026, or 125 until it arrives. For the precise months/days/hours, enter your full date of birth in the calculator above — e.g. 1900-06-15 gives a different day-count than 1900-12-01.
What generation is someone born in 1900?
What is the Chinese zodiac for 1900?
1900 is the Year of the Rat. Chinese zodiac cycles every 12 years, so 1888 and 1912 are also Years of the Rat.
Was 1900 a leap year and what weekday was 1900-01-01?
No — 1900 had 365 days. 1900 started on a Monday and ended on a Monday. That weekday repeats for every birthday in 1900.
How do I find my birthday weekday and next 100 birthdays?
Use the calculator above — after you calculate, scroll to “Your next 100 birthdays” for every weekday plus milestones 18, 21, 30… Or compare ages with family on any past or future date.