Sorry the lyrics are probably wrong because I couldn't find them anywhere!
If you tune your guitar down one whole step I think it's in the same key that they sing it in

E (022100@1)name="chord_x02220@1">A E (022100@1) 
E A E

E (022100@1)        A (x02220@1)           
  Hey girl I'm waiting on ya
E (022100@1) A (x02220@1)        
  I'm waiting on ya
E (022100@1)           A (x02220@1)              B (x2444x@1) Come on and let me sneak you out
E (022100@1)          A (x02220@1) And have a celebration
E (022100@1) A (x02220@1) A celebration
E (022100@1)         A (x02220@1)            B (x2444x@1) The music up the windows down

C#m (x13321@4)  A (x02220@1)        E (022100@1)          B (x2444x@1) Yeah, we'll be doing what we do
        C#m (x13321@4)              AJust (x02220@1)pretending that we're cool
       BAnd (x2444x@1)we know it's true
C#m (x13321@4)  A (x02220@1)        E (022100@1)          A (x02220@1) Yeah, we'll be doing what we do
         C#m (x13321@4)            AJust (x02220@1)pretending that we're cool
     BSo (x2444x@1)tonight

E (022100@1)                             A (x02220@1) B (x2444x@1) ELet's (022100@1)go crazy crazy crazy crazy 'til we see the sun
  E (022100@1)                           A (x02220@1)  B (x2444x@1)  EI (022100@1)know we only met but let's pretend it's love
    E (022100@1)                        A (x02220@1)name="chord_x2444x@1">B  C#mAnd (x13321@4)never never never stop for anyone
E (022100@1)           C#m (x13321@4)  
Tonight let's get some
A (x02220@1)And live while we're young

E (022100@1)  A (x02220@1)  B (x2444x@1)name="chord_x13321@4">C#m   A (x02220@1) E (022100@1)name="chord_022100@1">E    A (x02220@1)  B (x2444x@1)  C#m (x13321@4)     A (x02220@1) 
Tonight let's get some

And live while we're young

E (022100@1)A (x02220@1)E (022100@1)E (022100@1)        A (x02220@1)           
  Hey girl it's now or never
E (022100@1) A (x02220@1)        
  now or never
E (022100@1)           A (x02220@1)             B (x2444x@1) Don't over think just let it go
E (022100@1)          A (x02220@1) And if we get together
E (022100@1) A (x02220@1) get together
E (022100@1)         A (x02220@1)                     B (x2444x@1) Don't let the pictures leave your phone

C#m (x13321@4)  A (x02220@1)        E (022100@1)          A (x02220@1) Yeah, we'll be doing what we do
         C#m (x13321@4)            AJust (x02220@1)pretending that we're cool
     BSo (x2444x@1)tonight

E (022100@1)                             A (x02220@1) B (x2444x@1) ELet's (022100@1)go crazy crazy crazy crazy 'til we see the sun
  E (022100@1)                           A (x02220@1)  B (x2444x@1)  EI (022100@1)know we only met but let's pretend it's love
    E (022100@1)                        A (x02220@1)name="chord_x2444x@1">B  C#mAnd (x13321@4)never never never stop for anyone
E (022100@1)           C#m (x13321@4)  
Tonight let's get some
A (x02220@1)And live while we're young

E (022100@1)  A (x02220@1)  B (x2444x@1)name="chord_x13321@4">C#m   A (x02220@1) E (022100@1)name="chord_022100@1">E    A (x02220@1)  B (x2444x@1)  C#m (x13321@4)     A (x02220@1) 
Tonight let's get some

And live while we're young

E (022100@1)   B (x2444x@1)    C#m (x13321@4)    A (x02220@1)   E (022100@1)     B (x2444x@1)      C#m (x13321@4)    AAnd (x02220@1)girl  you and I      we're 'bout to make some memories
    E (022100@1)     B (x2444x@1)                     C#m (x13321@4)    A (x02220@1) Tonight   I wanna live while we're young   We

wanna live while we're young

E (022100@1)                             A (x02220@1) B (x2444x@1) ELet's (022100@1)go crazy crazy crazy crazy 'til we see the sun
  E (022100@1)                           A (x02220@1)  B (x2444x@1)  EI (022100@1)know we only met but let's pretend it's love
    E (022100@1)                        A (x02220@1)name="chord_x2444x@1">B  C#mAnd (x13321@4)never never never stop for anyone
E (022100@1)           C#m (x13321@4)  
Tonight let's get some
A (x02220@1)And live while we're young

E (022100@1)                             A (x02220@1) B (x2444x@1) Ecrazy (022100@1)crazy crazy crazy 'til we see the sun
  E (022100@1)                           A (x02220@1)  B (x2444x@1)  EI (022100@1)know we only met but let's pretend it's love
    E (022100@1)                        A (x02220@1)name="chord_x2444x@1">B  C#mAnd (x13321@4)never never never stop for anyone
E (022100@1)           C#m (x13321@4)  
Tonight let's get some
A (x02220@1)And live while we're young

E (022100@1)  A (x02220@1)  B (x2444x@1)name="chord_x13321@4">C#m   A (x02220@1) E (022100@1)name="chord_022100@1">E    A (x02220@1)  B (x2444x@1)  C#m (x13321@4)     A (x02220@1) 
Tonight let's get some

And live while we're young