When do you use '세', not '살' for Korean age?

in news(VERY OFFICIAL THING), they use ~세. You have to use Chinese nb with the unit. : 일 세, 이 세, 삼 세... 이십 세...
(normally with '만') ; 만 일 세, 만 이 세, 만 삼 세... 만 이십 세...

Generally we use 살, with Korean numbers. : 한 살, 두 살, 세 살... 스무 살...

If you wanna see more common mistakes, check our youtube channel.:
https://youtube.com/c/koreanlabX

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