Keith Urban - Days Go By Lyrics Meaning

This song is simple. Mr. Urban is talking about how time flies. Sort of like Kenney Chesney's Don't Blink. One minute your young and the next your old. In the song Mr. Urban mentions "I can feel 'em flyin' like a hand out the window in the wind, as the cars go by....." which means that just like cars zip past your window in the car, days zip past you.