Translation of "Birthday" in Korean

So anyway, flash forward to my 18th birthday,

제 18살 생일로 돌아가 볼게요.

Just because it's someone's birthday, or just because it's Christmas

단지 누구 생일이라서 아니면 크리스마스라서

That's the number of women who were married before their 18th birthday.

18세 이전에 결혼하는 아이들이

A third of the children did not live to see their fifth birthday,

어린아이의 30%는 5세 이전에 사망했습니다.