Quick facts if you are 100
| Born in | 1925 or 1926 |
| Generation | The Greatest Generation |
| Chinese zodiac | Ox (1925) or Tiger (1926) |
| Days old (approximately) | 36,525 to 36,889 |
How to work it out
Subtract your age from the current year: 2026 − 100 = 1926. That is your birth year if your birthday has already happened this year. If it hasn’t, subtract one more year: 1925. The same rule works for any age, and you can check the result the other way round with our born in 1926 page.
Milestones
Milestones you have already reached:
- 16 (1941 or 1942): Full driver’s license possible in many US states
- 18 (1943 or 1944): Voting age in US elections
- 21 (1946 or 1947): Legal drinking age in the US
- 25 (1950 or 1951): Car rental usually without a young-driver fee
- 26 (1951 or 1952): Coverage on a parent’s health plan ends (Affordable Care Act)
- 35 (1960 or 1961): Old enough to be President of the United States
- 62 (1987 or 1988): Earliest age to claim (reduced) Social Security benefits
- 65 (1990 or 1991): Medicare eligibility
If you were born in 1926, your Social Security full retirement age is 65; for 1925 it is 65.
Frequently asked questions
If I’m 100, what year will I turn 110?
In 2036 if your birthday has passed this year, otherwise in 2035.
What year did I turn 18 if I’m 100?
In 1944 if your birthday has passed this year, otherwise in 1943.