MY GAP YEAR VOLUNTEERING TRIP- advice, pros, cons, story time 

I used Kilroy who give lots of different trips that are planned for you. The camp I stayed at with the program organized is Jakera :)

Hi! The age range was 17-29, so there were a few over the age of 25 but most were younger. But I think it really depends on the organisation, place and volunteering that you choose to do. At the same time the age did not matter when we were all together everyone got along and had fun (no one is the same person when they go on holiday :)). Hope this helps and good luck!