rseeker

Sounds to me like you're doing GREAT.

To me, the right amount of riding is whatever makes you want to go again after the ride is over. When you're starting up a new challenging activity, maintaining your own motivation is key. So I'd say do what's fun and feels good to you. That could be: keeping stats or not. Riding hills or flat. Riding group or solo. Riding for challenge or riding to get out and about. Riding roads or trails. Riding upright or aero. Riding five miles or fifty. Seriously, whatever does it for you and keeps you coming back for more, that's the right amount IMO.

I'm 57, and I'm maintaining blood pressure and glucose metabolism in part with riding and other activities. Exercise is a wonder drug. Just wait, if you stick with it you'll be impressing yourself with the results and have plenty to brag about.

EDIT to add "in part". I'm also taking medication, but the difference between exercise+medication and medication alone is so dramatic that it's like having very different, much more manageable conditions.