How old is someone named Dennis?
The average Dennis is 63 years old.
Half of all living Dennises are between 55 and 75.
When was Dennis popular?
Dennis peaked in 1952 and has been given less and less ever since. Only 381 babies got the name in 2025.
Popular names of 1952 · The most popular names of the 1950s →
Show the numbers by decade
| Born in | Babies born | Alive today |
|---|---|---|
| 1900s | 988 | 0 |
| 1910s | 4,203 | 0 |
| 1920s | 8,241 | under 100 |
| 1930s | 26,507 | 4,300 |
| 1940s | 162,574 | 73,000 |
| 1950s | 204,785 | 130,000 |
| 1960s | 95,405 | 76,000 |
| 1970s | 50,912 | 46,000 |
| 1980s | 30,712 | 29,000 |
| 1990s | 18,270 | 18,000 |
| 2000s | 10,621 | 10,000 |
| 2010s | 6,018 | 6,000 |
| 2020s | 2,430 | 2,400 |
How many Dennises are still alive?
About 400,000 Dennises are alive in the US today. That's 64% of the roughly 620,000 babies named Dennis since 1880.
Roughly half of all Dennises ever born are still living.
What generation is the name Dennis?
More than half of living Dennises are Baby Boomers, born between 1946 and 1964.
Is Dennis an old name?
Yes. Dennis is older than 93 in 100 names on AgeByName.
Looking ahead: if babies keep getting the name at today's pace, the typical Dennis will be 66 in 2056, about the same as today.
Is Dennis a boy or girl name?
Almost entirely boys: 99.5% of living Dennises are men.
Names the same age as Dennis
NAME TWIN
Dennis's name twin is Kathleen. Of all 3,713 names on AgeByName, Kathleen's age curve is the closest match to Dennis's: 94% alike.
Other spellings: Denis (51)
Think you can guess a Jessica's age?
Ten names, one slider each. Share your score.
Questions about the name Dennis
How old is the average Dennis?
The average Dennis in the US is 63 years old. The median is 68, so half are older and half younger.
How many people are named Dennis?
About 400,000 Dennises are alive in the US today, out of roughly 620,000 babies given the name since 1880.
When was the name Dennis most popular?
In 1952, when about 25,000 baby boys were named Dennis.
Is Dennis a Boomer name?
Yes. About 56% of living Dennises are Baby Boomers, born between 1946 and 1964.
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