Forget the age topic. Figure out what you like, what you value, and find a suitable bike. I like to spend a day in the saddle, and I like classic styling, so I built a steel framed bike with clearance for wide tires and mounts for fenders. I'll ride brevets with people on carbon road bikes with naked wheels and 23mm tires.
Endurance, gravel, cross, rando/brevet, and all road are marketing terms, but they are resulting in more bikes that offer a wider variety of features like wide tire clearance, mounts, brake types, gearing options, frame geometries, and frame materials. If you're in the market for a bike, i think there are more off the shelf options now than we've ever had.