I know some older horses who are jumping a decent height and if they can still do it comfortably and remains sound, great. Often a horse will tell you when he's no longer able to do it. Starting to stop at fences or show signs of soreness after jumping are the most obvious signs but things like missing lead changes behind, always chipping in instead if leaving long, getting more short strided, bucking or pinning ears, etc are signs that their bodies are getting older and that it's time to lower the fences. I believe strongly in taking care of an older jumping horse with whatever you can afford, injections, adequan, legend, supplements, wraps, boots, packing feet. Etc etc. there are lots of things that can help your horse stay sounder longer but it is important as a responsible horse owner to know when to lower the jumps or stop jumping altogether.
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