Sooooooo.......I went ahead and looked at this boy. He is adorable, personable, and incredibly tolerant/safe with children on the ground. Unfortunately he beyond the last 4 years,very little is know of his past.The owner before them, vaguely mentioned rodeo....but no details.Whatever he was used for, they used him hard. He had one of the worst sway backs that I have ever seen. They assured me that he is not in any discomfort. So we went ahead and rode him. But only in a very small arena. Oh boy! He has the body of a 30 year old BUT the gas pedal of a youngster. NOT a kids horse. Barely a tap from a beginners unstable leg and he BOOM full extended canter.....and wanted to go faster. Great fun for me.....in the safety of the arena. Not going to work for my child. Afraid the options for him are going to be limited. They admitted that his future workload should be pretty light, due to his back. But he is too much for most young riders. Plus the age was a guess. My friend that is a large animal vet took, took one look at the pics and guessed him well over 20.....but who really knows.CERTAINLY NOT a $4500 horse!....he needs to be given away.IMHO I really hope this old boy finds someone to love him. In the mean time ,we keep looking. Thank you for all your advise, insights, and comments!