Well, I AM 64" exactly (well, 63 and 3/4, but lets not get technical). Still out of luck, eh? Why is the beginning age four and can I bend that? My dd will be 3 (two months shy of four) and she is the fearless daredevil. I am sure that if she went a few times that would encourage by timid 5 yo ds. Do they check the kids' ages? Can I sneak her on?