native · counting things, age · before a counter: 스무 (스무 살) · 21+: 스물한 살
twenty
Example
제 동생은 스무 살이에요.
My younger sibling is twenty years old.
Good to know
Alone before a counter it becomes 스무: 스무 살. With a unit digit it stays 스물: 스물두 살.
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