Ride as you like, and as you feel safe. Problems happen when you stretch for something outside your comfort. I may put on 15-20,000 miles a year, but I lost my bike and nearly my life for it. As they say, its not if you crash, it's if you get back on. I will be shopping for a new bike, and living in Wisconsin allows me about 5 months to get it done without missing much.Can’t comment much as I am a complete newbie compared with you iron butts here. Longest single stretch I did on my rebel 500 was about 120km, 2/3 of a full tank. Not at all confident so sat in the slow lane. Indeed, not much power to give past 100km/h. As for its weight, never felt it was unstable.
The wind and rattle sure became tiring after a while, so would agree it’s probably better suited as a city/backroad cruiser. But it’s a capable bike I feel.
You don't get to be a greybeard too easily. If you don't love riding, pick another hobby. Something safe like smoking...
As you probably guessed, I am not very popular and hear quite a few lectures at work.
-Doc