Hi,
My husband did the Surf School at Typhoon Lagoon in April this year. I do not know whether there is an age restriction but you do need to be a strong swimmer. The cost was $135 all in.
We arrived 2 1/2 hours before the park opened. First of all the participants (about 12 of them ) had dryside instruction in how to do a pop up onto the board, then they got in the water and had a go at paddling. After that the two surf instructors rode a wave and showed how the pros surf and then the participants got in the pool two at a time and had a go. They each rode about 10 waves each altogether. It was very cool. The rest of the family can go in and watch too and take pictures and video. We had a great holiday but that was definately the highlight.
Karen