How old is someone named Lillian?
The average Lillian is 29 years old.
Half of all living Lillians are between 11 and 41. The average sits between a large young group and an older one, so many Lillians are much younger than 29.
When was Lillian popular?
Lillian has never really gone out of style. Parents have chosen it every year for more than a century; its busiest year was 1920.
Popular names of 1920 · The most popular names of the 1920s →
Show the numbers by decade
| Born in | Babies born | Alive today |
|---|---|---|
| 1900s | 32,646 | 0 |
| 1910s | 76,158 | under 100 |
| 1920s | 83,492 | 1,300 |
| 1930s | 37,616 | 7,200 |
| 1940s | 22,405 | 12,000 |
| 1950s | 16,560 | 13,000 |
| 1960s | 10,663 | 9,300 |
| 1970s | 5,379 | 5,000 |
| 1980s | 5,404 | 5,200 |
| 1990s | 11,242 | 11,000 |
| 2000s | 49,466 | 49,000 |
| 2010s | 65,001 | 65,000 |
| 2020s | 24,907 | 25,000 |
How many Lillians are still alive?
About 200,000 Lillians are alive in the US today. That's 43% of the roughly 480,000 babies named Lillian since 1880.
Most Lillians ever born have died: the name was most popular in 1920, long enough ago that many of those babies are gone.
What generation is the name Lillian?
About two in five living Lillians are in Gen Z, born between 1997 and 2012.
Is Lillian an old name?
Somewhat. Lillian is older than 50 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 Lillian will be 34 in 2056, so the name is aging slowly.
Is Lillian a boy or girl name?
Almost entirely girls: 99.9% of living Lillians are women.
Names the same age as Lillian
NAME TWIN
Lillian's name twin is Lila. Of all 3,713 names on AgeByName, Lila's age curve is the closest match to Lillian's: 88% alike.
Other spellings: Lilian (19)
Compare: Lillian vs. Lily · Lilian vs. Lillian
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Questions about the name Lillian
How old is the average Lillian?
The average Lillian in the US is 29 years old. The median is 18, so half are older and half younger.
How many people are named Lillian?
About 200,000 Lillians are alive in the US today, out of roughly 480,000 babies given the name since 1880.
When was the name Lillian most popular?
In 1920, when about 10,000 baby girls were named Lillian.
Is Lillian a Gen Z name?
Partly. Gen Z are the largest group, about 37% of living Lillians, 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