WARNING: This isn't intended to sound exactly like Death Cab's Version. It's just a way 
play it with one acoustic guitar. I didn't include the interludes. This is just the 
progression of the song.

Tuning: EbAbDbGbBbEb

C#m7                E5        E/D#
  You may tire of me as our December sun is
 Asus2                                E/A      E/D#
setting because I'm not who I used to be
C#m7                        E5                    E/D#
  No longer easy on the eyes but these wrinkles masterfully
     Asus2                E/A        E/D#
disguise the youthful boy below
C#m7                         E5             E/D#
  who turned your way and saw something he was not looking
 Asus2                        E/A    E/D#
for: both a beginning and an end
C#m7                   E5          E/D#
But now he lives inside someone he does not
     Asus2                        E/A      E/D#
recognize when he catches his reflection on accident

etc.