Go for it. I returned to riding after 20 years, and in two seasons my horse earned himself 49 ribbons, mostly blue. He’s 22 and I am 67 – if we can do it, so can you. We even had a bad fall (he was lame and I tore all the ligaments in my shoulder), but we recovered and still ride, although I am leery of cantering now.
It is never the horse's fault