Welcome Stan,
I just turned 50 and ride pretty exclusively on roads or trails. I would think unless you have good places nearby to off road, or will stay under 30 miles per ride, something in the comfort bike style would work well for you. I just picked up a comfort bike (Specialized Sequoia as a birthday present) and really like the ride with the carbon fork and stays. Although I have an old mountain bike in addition to my road bikes, I never ride the thing. Just seems too heavy and slow and lacks the hand positions. I'll use my touring bike with 38c tires for gravel and non-paved trails, and that works great.
Best advice is to find a good lbs that offers a variety and do some test riding. I think the length of rides you anticipate will have as much to do with your choice as the conditions of the terrain/road. Good luck.
Bob