How old is someone named Reilly?
The average Reilly is 21 years old.
Half of all living Reillys are between 16 and 27.
When was Reilly popular?
Reilly was a boom name: it shot up, peaked in 1997, and dropped away. That's why most Reillys are close to the same age.
Popular names of 1997 · The most popular names of the 1990s →
Show the numbers by decade
| Born in | Babies born | Alive today |
|---|---|---|
| 1950s | 13 | under 100 |
| 1970s | 24 | under 100 |
| 1980s | 314 | 300 |
| 1990s | 2,628 | 2,600 |
| 2000s | 4,353 | 4,300 |
| 2010s | 2,055 | 2,000 |
| 2020s | 701 | 700 |
How many Reillys are still alive?
About 9,900 Reillys are alive in the US today. That's 98% of the roughly 10,000 babies named Reilly since 1953.
Nearly every Reilly ever born is still alive, because almost all of them are young.
What generation is the name Reilly?
About two in three living Reillys are in Gen Z, born between 1997 and 2012.
- Millennial 13%
- Gen Z 67%
- Gen Alpha 19%
Is Reilly an old name?
Not really. Reilly is younger than 67 in 100 names on AgeByName.
Looking ahead: if babies keep getting the name at today's pace, the typical Reilly will be 42 in 2056, so the name is getting older.
Is Reilly a boy or girl name?
Both. 55% of living Reillys are women and 45% are men.
The women average 22 and the men 21.
Names the same age as Reilly
NAME TWIN
Reilly's name twin is Madison. Of all 3,713 names on AgeByName, Madison's age curve is the closest match to Reilly's: 93% alike.
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Questions about the name Reilly
How old is the average Reilly?
The average Reilly in the US is 21 years old. The median is 22, so half are older and half younger.
How many people are named Reilly?
About 9,900 Reillys are alive in the US today, out of roughly 10,000 babies given the name since 1953.
When was the name Reilly most popular?
In 1997, when about 540 baby girls were named Reilly.
Is Reilly a Gen Z name?
Yes. About 67% of living Reillys are in Gen Z, born between 1997 and 2012.
Is Reilly a boy or girl name?
Both. 55% of living Reillys are women and 45% are men. The women average 22 and the men 21.
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