Not all are. My friends have a 20 yo and he's calm and very sweet. (Unless you want him to go and theres barrels/open field! Lol)
My sisters friend has a 3yo mare that is VERY green and off track. I can't tell you how calm she is. Not hot or anything. Now I know why she left the track so soon. Lol.
I agree with above, unless he's somehow gaited?
He's a cutie.