How old is someone named Sebastian?
The average Sebastian is 14 years old.
Half of all living Sebastians are between 6 and 20.
When was Sebastian popular?
Sebastian is a modern favorite: it climbed through the 2000s and hit its high in 2016. 8,615 babies got the name in 2025.
Popular names of 2016 · The most popular names of the 2010s →
Show the numbers by decade
| Born in | Babies born | Alive today |
|---|---|---|
| 1900s | 89 | 0 |
| 1910s | 838 | 0 |
| 1920s | 1,231 | under 100 |
| 1930s | 774 | under 100 |
| 1940s | 574 | 240 |
| 1950s | 500 | 330 |
| 1960s | 1,113 | 900 |
| 1970s | 1,413 | 1,300 |
| 1980s | 2,856 | 2,700 |
| 1990s | 14,664 | 14,000 |
| 2000s | 54,001 | 53,000 |
| 2010s | 86,811 | 86,000 |
| 2020s | 53,522 | 53,000 |
How many Sebastians are still alive?
About 210,000 Sebastians are alive in the US today. That's 97% of the roughly 220,000 babies named Sebastian since 1881.
Nearly every Sebastian ever born is still alive, because almost all of them are young.
What generation is the name Sebastian?
More than half of living Sebastians are in Gen Alpha, born in 2013 or later.
- Gen X under 1%
- Millennial 5%
- Gen Z 37%
- Gen Alpha 56%
Is Sebastian an old name?
No. Sebastian is one of the youngest names around: younger than 85 in 100 names on AgeByName.
Looking ahead: if babies keep getting the name at today's pace, the typical Sebastian will be 28 in 2056, so the name is aging slowly.
Is Sebastian a boy or girl name?
Almost entirely boys: 99.8% of living Sebastians are men.
Names the same age as Sebastian
NAME TWIN
Sebastian's name twin is Annalise. Of all 3,713 names on AgeByName, Annalise's age curve is the closest match to Sebastian's: 95% alike.
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Questions about the name Sebastian
How old is the average Sebastian?
The average Sebastian in the US is 14 years old. The median is 12, so half are older and half younger.
How many people are named Sebastian?
About 210,000 Sebastians are alive in the US today, out of roughly 220,000 babies given the name since 1881.
When was the name Sebastian most popular?
In 2016, when about 10,000 baby boys were named Sebastian.
Is Sebastian a Gen Alpha name?
Yes. About 56% of living Sebastians 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