I Wanna Grow Old With You by Westlife is in Eb at 64 beats per minute and runs 4:02 across 37 bars. It uses 15 chords — Bb, Ebsus2, Ebmaj7sus2, Cm7, F, Fsus2, Eb, Gm7, and a few more. The chord diagram changes as the song plays and the words light up as they are sung, so you can strum and sing along without reading ahead.
Want the melody line note by note? I Wanna Grow Old With You guitar melody tab.