How old is someone named Jillian?
The average Jillian is 31 years old.
Half of all living Jillians are between 22 and 40.
When was Jillian popular?
Jillian was at its most popular in the early 1980s. Parents have been moving away from it for decades, and 177 babies were named Jillian in 2025.
Popular names of 1982 · The most popular names of the 1980s →
Show the numbers by decade
| Born in | Babies born | Alive today |
|---|---|---|
| 1940s | 37 | under 100 |
| 1950s | 86 | under 100 |
| 1960s | 333 | 300 |
| 1970s | 4,685 | 4,400 |
| 1980s | 25,574 | 25,000 |
| 1990s | 19,761 | 19,000 |
| 2000s | 22,861 | 23,000 |
| 2010s | 8,730 | 8,700 |
| 2020s | 1,357 | 1,300 |
How many Jillians are still alive?
About 82,000 Jillians are alive in the US today. That's 98% of the roughly 83,000 babies named Jillian since 1944.
Nearly every Jillian ever born is still alive, because almost all of them are young.
What generation is the name Jillian?
About two in five living Jillians are Millennials, born between 1981 and 1996.
- Gen X 8%
- Millennial 45%
- Gen Z 40%
- Gen Alpha 7%
Is Jillian an old name?
Somewhat. Jillian is older than 52 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 Jillian will be 56 in 2056, so the name is aging fast.
Is Jillian a boy or girl name?
Almost entirely girls: 99.7% of living Jillians are women.
Names the same age as Jillian
NAME TWIN
Jillian's name twin is Lacie. Of all 3,713 names on AgeByName, Lacie's age curve is the closest match to Jillian's: 89% alike.
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Questions about the name Jillian
How old is the average Jillian?
The average Jillian in the US is 31 years old. The median is 31, so half are older and half younger.
How many people are named Jillian?
About 82,000 Jillians are alive in the US today, out of roughly 83,000 babies given the name since 1944.
When was the name Jillian most popular?
In 1982, when about 3,100 baby girls were named Jillian.
Is Jillian a Millennial name?
Partly. Millennials are the largest group, about 45% of living Jillians, 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