I dont know alot about that but we do have a league atleast , however , I woudnt say that american football is big in sweden, the two main sports most swedish childs / grownups play is probably soccer and ice hockey.
there is a U16 league which means under 16 , people under 16 can be on this one. there is also u19 and senior.
Well, there is even one for small kids 10-12 which is called "pee-wee".
Evryone, thanks for the advice. I wanted to ask these questions since I wont try playing it untill it?s summer, (still mass snow here) and I want to know what I shoud aim for. <3