How old is someone named Thea?
The average Thea is 20 years old.
Half of all living Theas are between 5 and 30. The average sits between a large young group and an older one, so many Theas are much younger than 20.
When was Thea popular?
Most of the Theas in the country were born in the last 15 years. The name peaked in 2018 and is still near the top.
Popular names of 2018 · The most popular names of the 2010s →
Show the numbers by decade
| Born in | Babies born | Alive today |
|---|---|---|
| 1900s | 87 | 0 |
| 1910s | 157 | 0 |
| 1920s | 259 | 0 |
| 1930s | 207 | under 100 |
| 1940s | 431 | 250 |
| 1950s | 1,027 | 800 |
| 1960s | 1,099 | 970 |
| 1970s | 1,008 | 950 |
| 1980s | 1,022 | 990 |
| 1990s | 952 | 940 |
| 2000s | 1,362 | 1,300 |
| 2010s | 6,408 | 6,400 |
| 2020s | 5,908 | 5,900 |
How many Theas are still alive?
About 19,000 Theas are alive in the US today. That's 92% of the roughly 20,000 babies named Thea since 1880.
Nearly every Thea ever born is still alive, because almost all of them are young.
What generation is the name Thea?
About two in three living Theas are in Gen Alpha, born in 2013 or later.
Is Thea an old name?
Not really. Thea is younger than 70 in 100 names on AgeByName.
Looking ahead: if babies keep getting the name at today's pace, the typical Thea will be 26 in 2056, so the name is aging slowly.
Is Thea a boy or girl name?
Almost entirely girls: over 99.9% of living Theas are women.
Names the same age as Thea
NAME TWIN
Thea's name twin is Rhett. Of all 3,713 names on AgeByName, Rhett's age curve is the closest match to Thea's: 87% alike.
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Questions about the name Thea
How old is the average Thea?
The average Thea in the US is 20 years old. The median is 9, so half are older and half younger.
How many people are named Thea?
About 19,000 Theas are alive in the US today, out of roughly 20,000 babies given the name since 1880.
When was the name Thea most popular?
In 2018, when about 1,200 baby girls were named Thea.
Is Thea a Gen Alpha name?
Yes. About 64% of living Theas are in Gen Alpha, born in 2013 or later.
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