How old is someone named Lilly?
The average Lilly is 19 years old.
Half of all living Lillys are between 10 and 21.
When was Lilly popular?
Lilly had one big moment, peaking in 2010. 54% of the babies ever named Lilly arrived in a single 15-year stretch.
Popular names of 2010 · The most popular names of the 2010s →
Show the numbers by decade
| Born in | Babies born | Alive today |
|---|---|---|
| 1900s | 1,314 | 0 |
| 1910s | 2,369 | 0 |
| 1920s | 2,964 | under 100 |
| 1930s | 2,034 | 430 |
| 1940s | 1,596 | 880 |
| 1950s | 1,416 | 1,100 |
| 1960s | 1,134 | 990 |
| 1970s | 630 | 590 |
| 1980s | 714 | 690 |
| 1990s | 2,270 | 2,200 |
| 2000s | 17,295 | 17,000 |
| 2010s | 23,527 | 23,000 |
| 2020s | 7,601 | 7,600 |
How many Lillys are still alive?
About 55,000 Lillys are alive in the US today. That's 82% of the roughly 67,000 babies named Lilly since 1880.
Most Lillys ever born are still alive.
What generation is the name Lilly?
About half of living Lillys are in Gen Z, born between 1997 and 2012.
Is Lilly an old name?
Not really. Lilly is younger than 73 in 100 names on AgeByName.
Looking ahead: if babies keep getting the name at today's pace, the typical Lilly will be 33 in 2056, so the name is aging slowly.
Is Lilly a boy or girl name?
Almost entirely girls: over 99.9% of living Lillys are women.
Names the same age as Lilly
NAME TWIN
Lilly's name twin is Landon. Of all 3,713 names on AgeByName, Landon's age curve is the closest match to Lilly's: 91% alike.
Think you can guess a Ashley's age?
Ten names, one slider each. Share your score.
Questions about the name Lilly
How old is the average Lilly?
The average Lilly in the US is 19 years old. The median is 15, so half are older and half younger.
How many people are named Lilly?
About 55,000 Lillys are alive in the US today, out of roughly 67,000 babies given the name since 1880.
When was the name Lilly most popular?
In 2010, when about 2,900 baby girls were named Lilly.
Is Lilly a Gen Z name?
Partly. Gen Z are the largest group, about 49% of living Lillys, 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