Yes, you are right he was only 9.
And there are plenty of horses who have raced more times than him, many over 100 times while his was something in the 60's. But for me a horse which is essentially a flat horse type, that is, fairly light boned and one who raced at two and was probably in training even before he turned two, being in chase races at 9 is still a long haul.
It's just my opinion but if he were mine I would not have been sending him over a fence this late in his racing life, and would have treated him a bit more delicately having given me so many seasons already. (Athough I do realise that a shoulder can also break on the flat).
A real chaser who has been shown the ropes when young, then turned away each season, would have gone chasing much younger and might still be in their prime at 9.
A friend of mine who had an Ascot Gold Cup winning gelding retired him at 7 rather than send him hurdling which was the advice he got from many quarters. He said that the reason was not the toll the racing had taken on the horse's legs and bones, but all the training from when he had been sent to the yard as a yearling.
I am not usually one to criticise other people for what they do with their horses and it is a hard enough decision, this I know only too well. Whatever the reasons for the shoulder breaking, it is a damn shame for sure and Crow Wood was a good servant to his connections.