I have limited experience, but am a 51 going on 52 year old woman who got benched from running due to knee issues. I decided this summer, after my knee healed after surgery, to do some biking. I'd put some money away and wanted to buy a bike or bikes that would last. My husband has a hybrid bike, but mine is a comfort bike--a heavy Schwinn. Sturdy, but not easy or enjoyable to ride for fitness.

I bought a Lexa SL in July and I really love it. Its fast and enjoyable and comfortable, and I love so much that's its very light--but I also have some areas that I'd like to ride which are rocky or gravel roads and, with the weather turning here, I wanted something that I could ride at least three seasons. Last week, I purchased a Trek Lexa SL and it is also a great bike. I paid a little more to have hydraulic brakes. I find this bike to be a lot of fun, a bit easier to shift than the Lexa for whatever reason (experience, I'm sure), and I feel much safer in wet weather or going off the side of the road, etc.

I did try Specialized and Cannondales as well and did a bit of research. I was assured all three brands, as well as Surly (no dealer close by) were fine, and was told to buy the ones that felt the best to me. Riding, sitting and talking to people on forums like these helped a lot. Good luck, hope you find something you love.