A stocky stock horse should be fine, unless he will feel to big.
What is the main purpose of this horse? I assume its just to have fun and trail ride. Unless he has grand prix & world show aspersions in the next 5-15 years there should be no reason you need an "upgrade". Even if he wanted to learn to jump or do western trail or pleasure there is no reason you can't teach an old dog new tricks. People keep horses for a lifetime without the need to "upgrade". A friend of mine bought a well broke "been there done that" 9 y/o QH. She bought her right after she learned to canter, so the horse was beginner safe. She has done SO much with this horse in the past 6 years. EVERYTHING from reining (what she was originally trained in), to hunter paces, to the gymkhana ring, into the hunter/jumper ring, trail ride like a boss through state parks... Really there is NOTHING this horse hasn't risen to the occasion for!
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It will most likely be a trail horse. I don't honestly know, if he wants to do more I would like for him to have the option. 9 years old is perfectly fine. When I think of a been there done that horse I always jump to 16-18. Which was the age of my first horse.
She was a sweet horse. But, I eventually wanted to do barrels, which I did do. About a year or so after she started to break down. I was slow on the barrels I never really pushed her, she was just old. I stopped doing barrels with her because I refused to get rid of her, and she just couldn't do it anymore(Although in her mind she was a young spry 5 year old). One day we were just trotting around and she fell. She dislocated my hip, and my knee by falling on me.
After that she was never the same, I gave her away to my 'best friend'.. she was a kids horse for a while then she just disappeared. I don't know what happened to her. I don't ask because I don't want to know. I have a feeling, but I try to NEVER think of her... The above happened when I was 11ish.
I don't EVER want my husband to have to go through what I had too. Because of me being selfish and wanting a horse who could compete she probably got shot in the head in the middle of the desert somewhere...
Edit: She couldn't even really be ridden, she was always super energetic and wanted to go, but her body just couldnt.