Okay so hello everyone. I thought this was a really great cover song and wanted to find 
the chords so I figured Id make my own. This is my own rendition of it, listening to the 
song and not watching the actual video of them playing. Enjoy!

Standard Tuning: EADGBE
Capo: 1st fret

C7:    x32310
C7/G:  3x2310
F:     133211
F*:    x3321x
F/E:   xx201x
D7:    xx0212
D7/A:  x0x212
G:     xx5433 (you can bar this and make it a g7 with an E form)
G/D:   x55433
F7:    x8786x
F/D:   xx0210

usually with each chord you pluck the base note then the one a string directly below it; 
for instance, the C7 & C7/G is really playing a C7 and alternating between plucking the 
C and G below it before strumming.

F                    C7             F        C7
Fairy tales can come true, it can happen to you

          C7        C7/G         C7        C7/G
If you're young at heart.

F                    C7             F        C7
For it's hard, you will find, to be narrow of mind

             C7        C7/G         C7        C7/G
If you're young at heart.



         D7      D7/A         D7             D7/A
You can go to extremes with impossible schemes.

          G              G/D          G             G/D
You can laugh when your dreams fall apart at the seams.

      C         C/B           C          C/B       C
And life gets more exciting with each passing day.

     F*          F/E            F*        F/E      D
And love is either in your heart, or on it's way.



F                    C7             F        C7
 you know that it's worth every treasure on earth

          C7        C7/G         C7        C7/G
To be young at heart.

F                    C7             F        C7
For as rich as you are, it's much better by far

          C7        C7/G         C7        C7/G
To be young at heart.


         D7      D7/A         D7             D7/A
And if you should survive to 105,

          G              G/D           F7
Look at all you'll derive out of being alive!

(this part you can come up with something working around this)

D(string)-----7----------5-----3-----5----------3-----2-----
          And here is the best part, you have a head start

F      F/D
If you are among the very young at heart.

[Musical interlude]
Repeat Chorus chords:
F* C7 F C7 C7 etc..

F                    C7             F        C7
 you know that it's worth every treasure on earth

          C7        C7/G         C7        C7/G
To be young at heart.

F                    C7             F        C7
For as rich as you are, it's much better by far

          C7        C7/G         C7        C7/G
To be young at heart.


         D7      D7/A         D7             D7/A
And if you should survive to 105,

          G              G/D           F7
Look at all you'll derive out of being alive!

(this part you can come up with something working around this)

D(string)-----7----------5-----3-----5----------3-----2-----
          And here is the best part, you have a head start

F      F/D    F      F/D   F        F/D
If you are among the very young at heart.

F      F/D    F      F/D   F        F/D          F
If you are among the very young at heart.