살이야

… years old

→ 살
phrase Rare #28,601
… years old Used after an age number in casual speech. In other contexts, 살 can mean flesh or fat.
KO: 우리 아들은 다섯 살이야.
EN: My son is five years old.

여든 살 이야.

I'm eighty years old.

아, 그거 살 이야

Oh, that's fat.

— Tune in for Love (2019)