I'm turning 66 in October and I ride 30-32 miles a day with some rides up to 50 miles. I also ride 9 to 12 charity rides a year; most of them being metric centuries. My daily rides are normally under two hours. I seldom do recovery rides but often take one day a week off from riding so I can get things done around the house (wife's orders). I think it all comes down to what your body gets in the habit of doing on a daily basis.