How old is someone named Duncan?
The average Duncan is 32 years old.
Half of all living Duncans are between 17 and 41.
When was Duncan popular?
Duncan is a steady name: popular for generations, with a peak in 1997 but no single era. You'll meet Duncans of every age.
Popular names of 1997 · The most popular names of the 1990s →
Show the numbers by decade
| Born in | Babies born | Alive today |
|---|---|---|
| 1900s | 116 | 0 |
| 1910s | 542 | 0 |
| 1920s | 767 | 0 |
| 1930s | 653 | under 100 |
| 1940s | 1,178 | 510 |
| 1950s | 1,783 | 1,200 |
| 1960s | 1,389 | 1,100 |
| 1970s | 933 | 840 |
| 1980s | 1,414 | 1,300 |
| 1990s | 4,227 | 4,100 |
| 2000s | 3,965 | 3,900 |
| 2010s | 2,692 | 2,700 |
| 2020s | 1,315 | 1,300 |
How many Duncans are still alive?
About 17,000 Duncans are alive in the US today. That's 80% of the roughly 21,000 babies named Duncan since 1880.
Most Duncans ever born are still alive.
What generation is the name Duncan?
About two in five living Duncans are in Gen Z, born between 1997 and 2012.
Is Duncan an old name?
Somewhat. Duncan is older than 55 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 Duncan will be 42 in 2056, so the name is aging slowly.
Is Duncan a boy or girl name?
Almost entirely boys: 99.9% of living Duncans are men.
Names the same age as Duncan
NAME TWIN
Duncan's name twin is Coleman. Of all 3,713 names on AgeByName, Coleman's age curve is the closest match to Duncan's: 90% alike.
Think you can guess a Jessica's age?
Ten names, one slider each. Share your score.
Questions about the name Duncan
How old is the average Duncan?
The average Duncan in the US is 32 years old. The median is 28, so half are older and half younger.
How many people are named Duncan?
About 17,000 Duncans are alive in the US today, out of roughly 21,000 babies given the name since 1880.
When was the name Duncan most popular?
In 1997, when about 640 baby boys were named Duncan.
Is Duncan a Gen Z name?
Partly. Gen Z are the largest group, about 39% of living Duncans, 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