When You Were Young by The Killers is played in the key of Bb at a intermediate difficulty level, originally released in the 2000s. It uses 3 chords — Bb Eb F — arranged in the I-IV-V progression.
About the I-IV-V progression
The I-IV-V progression uses the three primary chords of the key — nothing else. It's the harmonic foundation of blues, folk, country, and early rock and roll. Learning to switch between these three chords fluently in every key is a fundamental milestone for beginner guitarists.
Playing in the key of Bb
Bb major uses Bb, Eb, and F, which are all barre or partial chords. Songs recorded in Bb are usually played with a capo on the 3rd fret using G-major shapes.
Related songs
More songs in the key of Bb
More songs using the I-IV-V progression
Learn to play When You Were Young by The Killers on guitar. It sits in the key of Bb and uses the I-IV-V progression with the chords Bb Eb F.