Now. Not completely old, but I'm 52 now. Last year I couldn't even climb a tree. When I go through my knees, I have to hold something to get up. It's also just laziness. When the kids were younger, I had to climb a tree to get one out of a tree, but now they don't want to go to playgrounds, climb trees etc, so I'm lazy. I don't even bike much anymore. Their dad has a car now and brings em to school and they're old enough to take the bus themselves. No need to bike much. He also brings em here now and picks em up.