Hi,
I started flying when i was 14 through the Air Cadets, and had one of the best experiences of my life so far. Whilst the flying you do with them doesnt really count towards anything in the world of commercial aviation, the experience is great, and did i mention free
In the 4 years i was a cadet i got a gliding scholarship- 8 hours in a motorglider, microlight scholarship- 10 hours, including solo, and several trips to RAF bases for aerobatic lessons, and helicopter rides, oh and a Boeing AWACS sim ride
If anything it means when you decide to invest in PPL lessons you will already know the basics, and will erm..fly through the lessons
Hope this helps