What does "young adult" mean?

A person who has achieved the age of majority but whose character and personality are still developing as they gain experience.

What is a synonym for "young adult"?

Common synonyms include: nineteens.

noun

noun ·Rare ·Advanced level

Noun

1
A person who has achieved the age of majority but whose character and personality are still developing as they gain experience. attributive, often
"Near-synonyms: AYA; emerging adult"
2
An adolescent; a genre of writing aimed primarily at this readership. attributive, capitalized, often, sometimes
"My favorite young adult writer, Jen Derbyshire, just published her 50th paperback novel, the latest in an adventure series spanning fifteen years."

"Near-synonyms: AYA; emerging adult"