I had a 72 year old and his son come to our camp for 2 days. The dad did better than the son. It took the dad 3 tries to get up on the wakeboard and we got him up on the wakeskate first try.
my great grandma slalom skied until she was 80, shes 97 now, its not wakeboarding, but i think thats more of an accomplishment cuz we have a video of her doin the bouys at 22 off at 35 mph