I have two.
Spy ( http://www.pedigreequery.com/spy+illusion ) was born in 1982 and I have had him since 1992. I paid $300 for him so that he would not go to the Thurmont auction untrained and footsore.
He has had mild hind end arthritis since the beginning, but he Evented through Novice in two long term leases until he was 18, when the hip arthritis turned into a refusal problem. He was still sound for riding until he was 24, when he developed some sort of sidebone or ringbone, which caused him to trip and go down on his knees when ridden.
He gets Hyalun every day, which seems to help some.
But he still loves the attention, and will come running in at dinner time as fast as the others.
He is a chronic mild cribber (controlled with a strap) but his teeth are petty ground down and he quids. But he still actively grazes and eats lots of hay.
Due to age related digestive changes he sometimes passes a bunch of watery stuff along with his manure. He now gets quite a lot of Triple Crown Senior, supplemented with rice bran oil when needed, and a digestive supplement, as well as a hoof/coat supplement. He has quite a few sarcoids on his sheath, and the vet has removed a couple that got large. But they do not seem to bother him.
He is always noisy at feeding time and wants to be fed first, which is fine since he gets the most food,and is the slowest eater. He wears a rainsheet when it is cold, wet, or windy, but rarely wears a real blanket. They are out 24/7 with access to their stalls and a couple of overhangs. He just keeps chugging along, seeming contented.
Music (3/4 TB x QH) was born in 1986, and I have had her since she was a long yearling. I was actively competing her into her early 20s, when degrading eyesight (lots of small cataracts) made jumping unsafe. I continued to ride her (and competed in dressage), until she was put on the back burner while I focused on competing a younger horse. She is still sound and active, and I rode her this summer while recuperating from knee surgery. She is also a great “pony” horse. She also has some arthritis, but it doesn’t affect her in light work with the Hyalun.
She has a weird musculo-skelatal problem (that may be related to Lyme disease) which is treated by being “under lights” from October to April. She gets the same supplements as Spy, plus Vitamin C and a monthly treatment of Levamasole. She hates sheets and blankets, so only wears one if it is really awful (about once every two years).
SHhe used to be a REALLY easy keeper, but now she has the same “watery” problem as Spy, and needs to be on Triple Crown Senior in the winter to maintain her weight. She goes back on Triple Crown Lite in the summer. Like the others, she has free access to hay all the time, and to pasture except when she is shut in at night for the lights. She has become quite swaybacked. but it doesn’t seem to bother her.