I think it's kind of interesting how your song When I Get Older is in 3/4 (unless you think of it as 6/4?) but doesn't have that "waltz feel" that a lot of other 3/4 songs do (A lot of country and folk songs come to mind). Like, I didn't even notice it was in 3 on my first listen. Do you have any thoughts or insight as to why this might be?
slower tempo. with each of the 3 parts being subdivided into 4 (16th notes) at a comfortable speed. i'm pretty sure none of the 'waltz' type songs you're thinking of are slow enough to be divided up that way