I wanted an old horse for my first horse. Ended up with a 6 year old thoroughbred. Best decision of my life. Even though he gets scared when the wind blows and ninjas creep out of the bushes, or that patch of grass has a tire mark, I gotta change direction, or I've been over this mat every single day for the last 2 months, but because its windy today its become a swirling vortex of death and is going to kill me, he is still amazing and even though I'm scared to death half the time, i've had so many great moments with him and I don't regret getting something so young. No, I'm no pro, and if he could defiently do some damage to me if he wanted to, but he's a ***** cat and he has the best intentions. So with all these health issues, and the fact you may want to re sell to go on to do something else with another horse, I would honestly consider looking elsewhere for something between the ages of 12-20. Its a wide range and some horses are amazing at 12, while others are not. You just have to look around, but I wouldnt look past anything because of age, whichever way it were :) also goodluck, I hope you find your dream horse!!