To join the Air Cadets you need to be between 13 and 17 and a half for the UK (Im not sure about Canada, New Zealand, Australia and the USA) It is well worth it, I have had about 8 hours of powered flying, and a couple gliding - all for free. I have also signed up for a flying scholarship, which is 10 days of intense flying in which you will evenutally fly solo. The problem with doing this is it really takes the fun out of flight sim! See
www.aircadets.org for details.