How old is someone named Colby?
The average Colby is 27 years old.
Half of all living Colbys are between 19 and 34.
When was Colby popular?
Colby was a boom name: it shot up, peaked in 2001, and dropped away. That's why most Colbys are close to the same age.
Popular names of 2001 · The most popular names of the 2000s →
Show the numbers by decade
| Born in | Babies born | Alive today |
|---|---|---|
| 1910s | 32 | 0 |
| 1920s | 90 | 0 |
| 1930s | 73 | under 100 |
| 1940s | 137 | under 100 |
| 1950s | 290 | 200 |
| 1960s | 476 | 390 |
| 1970s | 3,057 | 2,800 |
| 1980s | 7,749 | 7,300 |
| 1990s | 15,471 | 15,000 |
| 2000s | 20,040 | 20,000 |
| 2010s | 7,674 | 7,600 |
| 2020s | 3,061 | 3,000 |
How many Colbys are still alive?
About 56,000 Colbys are alive in the US today. That's 96% of the roughly 58,000 babies named Colby since 1888.
Nearly every Colby ever born is still alive, because almost all of them are young.
What generation is the name Colby?
About half of living Colbys are in Gen Z, born between 1997 and 2012.
- Boomer under 1%
- Gen X 6%
- Millennial 31%
- Gen Z 49%
- Gen Alpha 13%
Is Colby an old name?
Not really. Colby is younger than 55 in 100 names on AgeByName.
Looking ahead: if babies keep getting the name at today's pace, the typical Colby will be 46 in 2056, so the name is getting older.
Is Colby a boy or girl name?
Mostly a boy's name: 93% of living Colbys are men, and 7% are women.
The women average 29 and the men 27.
Names the same age as Colby
NAME TWIN
Colby's name twin is Emily. Of all 3,713 names on AgeByName, Emily's age curve is the closest match to Colby's: 89% alike.
Other spellings: Kolby (22)
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Questions about the name Colby
How old is the average Colby?
The average Colby in the US is 27 years old. The median is 25, so half are older and half younger.
How many people are named Colby?
About 56,000 Colbys are alive in the US today, out of roughly 58,000 babies given the name since 1888.
When was the name Colby most popular?
In 2001, when about 4,000 baby boys were named Colby.
Is Colby a Gen Z name?
Partly. Gen Z are the largest group, about 49% of living Colbys, but the name spans several generations.
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