Young by The Chainsmokers.

This song is written by Peter Hanna, Sean Jacobs and Taylor Bird and produced by Jordan “DJ Swivel” Young & The Chainsmokers.

"Young" is in the key of G flat Minor, for guitar player you should put capo on second fret to play this song on simple way. It uses just 4 chords on 4 5 6 5 progression for the entire song. Use Down Down Up Up Down Up strumming pattern per chord.

See example of chords lyrics here:

C                          D                       Em
 I'm calling you up, you tell me it's over
                          D
Say what you want, but it's hard when you're young
C                          D                       Em
 I'm calling you up, you tell me it's over
                          D
Say what you want, but it's hard when you're young