I have a longish for height torso, so when the pack was on and worn securely to my back it felt like it rode too high. The waist straps came around too high on my torso. Some of the straps were elasticised and I could feel that flexing as I got around. I gave it a fair go, used it for a good many days of snowboarding. It didn't get a run loaded with all the weight I normally take riding. Sold it on to one of my clients in japan who was very happy with it. He is a lean fellow and a fair bit shorter than I am.
No qualms about thr quality of the pack. It was a well manufactured piece of gear. It was to replace an evoc that gave me a lot of good years. I now have an osprey that I am not entirely happy with. The quest continues. Many years ago I had a pack from Kathmandu designed for use on snow. It was a lot longer than most packs I see these days. Oh how I yearn for another like it.
I am not a tall person either.
Depending on your upper body size and preference you may find it easier either running the small size harness and running the adjusters wound all the way out, or run the large harness and wind the adjusters all the way in. The bag comes with the larger sized harness by default.
I actually preferred having the bag sit higher up when I used it at the snow, as I spend more time on my arse than seasoned snowboarders haha.
On the bike though I am getting a bit over having a sweaty back in Summer, and after 6 seasons on the Uswe I recently bought a hip pack to see if I can resolve that issue. Funny you mention age as a pre requisite for hip packs. I think I am old enough now!