How old is someone named Theodore?
The average Theodore is 29 years old.
Half of all living Theodores are between 5 and 57. The average sits between a large young group and an older one, so many Theodores are much younger than 29.
When was Theodore popular?
Great-grandmother name, or brand-new favorite? Both. Theodore peaked around 1904, fell out of fashion, and is popular again today.
Popular names of 2025 · The most popular names of the 2020s →
Show the numbers by decade
| Born in | Babies born | Alive today |
|---|---|---|
| 1900s | 6,519 | 0 |
| 1910s | 21,204 | 0 |
| 1920s | 31,469 | 180 |
| 1930s | 25,088 | 3,000 |
| 1940s | 26,317 | 11,000 |
| 1950s | 29,144 | 19,000 |
| 1960s | 21,389 | 17,000 |
| 1970s | 13,658 | 12,000 |
| 1980s | 12,046 | 11,000 |
| 1990s | 10,113 | 9,800 |
| 2000s | 10,556 | 10,000 |
| 2010s | 40,549 | 40,000 |
| 2020s | 65,647 | 65,000 |
How many Theodores are still alive?
About 200,000 Theodores are alive in the US today. That's 63% of the roughly 320,000 babies named Theodore since 1880.
Roughly half of all Theodores ever born are still living.
What generation is the name Theodore?
About half of living Theodores are in Gen Alpha, born in 2013 or later.
Is Theodore an old name?
Somewhat. Theodore is older than 50 in 100 names on AgeByName, but younger than plenty of classics.
Looking ahead: if babies keep getting the name at today's pace, the typical Theodore will be 24 in 2056, so its average age will actually fall, as the youngest Theodores make up more of the total.
Is Theodore a boy or girl name?
Almost entirely boys: 99.8% of living Theodores are men.
Names the same age as Theodore
NAME TWIN
Theodore's name twin is Theodora. Of all 3,713 names on AgeByName, Theodora's age curve is the closest match to Theodore's: 88% alike.
Compare: Theodore vs. Teddy
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Questions about the name Theodore
How old is the average Theodore?
The average Theodore in the US is 29 years old. The median is 13, so half are older and half younger.
How many people are named Theodore?
About 200,000 Theodores are alive in the US today, out of roughly 320,000 babies given the name since 1880.
When was the name Theodore most popular?
In 2025, when about 13,000 baby boys were named Theodore.
Is Theodore a Gen Alpha name?
Yes. About 50% of living Theodores are in Gen Alpha, born in 2013 or later.
Estimates from Social Security Administration baby-name records (births 1880–2025) and SSA cohort life tables (2026 Trustees Report). Updated each spring. How we calculate this