Where are you thinking of staying?
I take my son every year and hes also 13 (14 in October). He loves football and is very active. We stay in the Siesta 1 and the reps would have football matches on certain days and there's water polo most days. There is a hotel in Alcudia that is very football orientated ... Lagotel ... but in my opinion (and this may not be the opinion of others) it wouldn't be in the busiest of areas in comparison to hotels situated in and around the main "strip" of bars and restaurants. However, if football is what's important then I believe there's plenty on offer. Its an AI hotel (i think) and a friend of mine stayed there year after year because she felt everything she needed was there for her and her boys and she didn't need to venture too far from the hotel.
When we are away, my son would join in with the football and water polo but he would also usually find a friend or two and the pool provides them with hours of fun (especially if they have water pistols!). Fingers crossed someone will have more "footie" info for you so that you can make a good informed choice before you book anything.