Get a road bike, or if you want something a little more sturdy for trals, get a cross bike. My personal opinion of hybrids is that they combine a mountain bike with a road bike and bring out the worst of both. I feel you are better off with a rigid mountain bike (no suspension) with road tires than with a hybrid. A cross bike was designed to go on roads and trails and mud and all that other stuff... If you are going to be mainly on the roads, get a road bike.
I was in Colorado in June and we went over Cottonwood pass--over 12,000 ft, and the main climb was 14 miles of dirt road, with gravel and such. We were on road bikes. It was not that bad.
Regardless of what you choose, enjoy!
(and welcome to the 50+ forum)
train safe-