I think if I remember rightly you have to be over 12. Two years ago from Turunc it cost £30 per person, but it will differ with who ever you book through (and of course it may have gone up).
It is a long day that included breakfast on arrival and a meal at the end. Our family had a fantastic time, they came back really buzzing, and said it was the most exciting day out they had ever had(I didn't go, not brave enough!).
You have to be reasonably fit as there is a certain amount of scrambling over rocks to do. The team who ran it were very professional, and knew exactly what they were doing.