As horses age they lose their muscle tone as old people do! He would never look like a 6yr old again but conditioning feed and hill work 2-3 times a week does wonders,also massage can help to tone up and release lactic.
I think he looks great] at 22!! He is so pretty, looks sweet too? I have a 23 year old buckskin who does not have that physique, To be blunt, he's fat. I hate it. Goodness I am a bad mom. Anyway I'll post a pic sometime if I figure out how to. Do you ride the Arab? He looks like he'd be fun.