Come off it- At our age Mountain biking is lunacy. They are heavy- gears don't work- Brakes definitely don't and the steerings a bit iffy aswell. And as to getting fit- you will have problem as you have to wait for the 20year olds at the top of each 15% 1 mile climb just so the group can collect.

Still riding in the winter up on the hills when the falls are on soft leaves or 6" of Mud but getting a bit too old to do it in the summer now. Body just can't take the 40 mph downhills on the rough ground.

But took up mountain biking in 1990 but if you saw the terrain round here- you would have done too.