Great, I just hit 65+ and I ride everyday. I have 3 folding bicycles and one even has air free Muffin tires (Citizen Miami 20") that is very handy. I've ridden 50+ miles in a day and would love to ride all over Arizona. Of course only in Flagstaff and Sedona in the Summer .
I even rode my bicycle 18 miles each way to work for about 2 years. It's the best exercise you can get. It's also the most efficient vehicle on the planet. I put it in the back of my all electric vehicle and tell people it's my range extender. It can go as fast as you can pedal and as far as you want to with no pollution.