i dont think this is exactly it but its pretty basic version and it sounds good to me 

ba–ba–ba–ba
G:––––––––––––––––––––––––|
D:––––––––––––––––6666666–|x2
A:––––––555555111111––––––|
D:–666666–––––––––––––––––|

Verses 
G:––––––––––––––––––––––––|
D:––––––––––––––––6666666–|
A:––––––555555111111––––––|
D:–666666–––––––––––––––––|

when i grow up
G:–––––––––––––––––––––––––––––––––––––|
D:–––––––––––––––––––––––––––––––––––––|
A:–66666666––––––––––––––––––––––––––––|x2
D:–––––––––3333333111111–––––––––––––––|