How old is someone named Cassidy?
The average Cassidy is 23 years old.
Half of all living Cassidys are between 17 and 30.
When was Cassidy popular?
Cassidy was a boom name: it shot up, peaked in 1999, and dropped away. That's why most Cassidys are close to the same age.
Popular names of 1999 · The most popular names of the 1990s →
Show the numbers by decade
| Born in | Babies born | Alive today |
|---|---|---|
| 1960s | 15 | under 100 |
| 1970s | 874 | 810 |
| 1980s | 4,477 | 4,300 |
| 1990s | 21,559 | 21,000 |
| 2000s | 21,661 | 21,000 |
| 2010s | 11,788 | 12,000 |
| 2020s | 4,209 | 4,200 |
How many Cassidys are still alive?
About 64,000 Cassidys are alive in the US today. That's 98% of the roughly 65,000 babies named Cassidy since 1968.
Nearly every Cassidy ever born is still alive, because almost all of them are young.
What generation is the name Cassidy?
About half of living Cassidys are in Gen Z, born between 1997 and 2012.
- Gen X 2%
- Millennial 25%
- Gen Z 55%
- Gen Alpha 19%
Is Cassidy an old name?
Not really. Cassidy is younger than 63 in 100 names on AgeByName.
Looking ahead: if babies keep getting the name at today's pace, the typical Cassidy will be 44 in 2056, so the name is getting older.
Is Cassidy a boy or girl name?
Mostly a girl's name: 94% of living Cassidys are women, and 6% are men.
The women average 23 and the men 29.
Names the same age as Cassidy
NAME TWIN
Cassidy's name twin is Tanner. Of all 3,713 names on AgeByName, Tanner's age curve is the closest match to Cassidy's: 91% alike.
Other spellings: Kassidy (19)
Think you can guess a Gary's age?
Ten names, one slider each. Share your score.
Questions about the name Cassidy
How old is the average Cassidy?
The average Cassidy in the US is 23 years old. The median is 25, so half are older and half younger.
How many people are named Cassidy?
About 64,000 Cassidys are alive in the US today, out of roughly 65,000 babies given the name since 1968.
When was the name Cassidy most popular?
In 1999, when about 3,400 baby girls were named Cassidy.
Is Cassidy a Gen Z name?
Yes. About 55% of living Cassidys are in Gen Z, born between 1997 and 2012.
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