The BTS member was born on December 4, 1992. As of today (in KST), his Korean age is 26 (25 internationally). In celebration of the big day, fans are sending out much love via Twitter with the hashtag #WorldwideHandsomeDay, which is currently trending #1 worldwide.
happy birthday to the person who had his own passion, who went to college to make a name for himself, who was scouted w/o any vocal & dance skills, who practiced while working to attain his degree, now, he finally got that & made smth for himself,im proud #WorldwideHandsomeDay— gwyneth // #WorldwideHandsomeDay (@tuantwothree93) December 3, 2017
Jin likes to call himself "Worldwide Handsome" due to his good looks hence the hashtag.
BTS also shared a video of Jin receiving his birthday cake: