John_V 

Before my retirement, last October, the company I was with was flexible on our hours as long as we put in eight hours for the day. I would skip lunch or come in an hour early so that I could get off at three instead of four. This allowed me to get in at least a twenty mile ride every day. On weekends, I would increase the mileage to forty miles. Maybe you could work out a similar arrangement with your employer, if you are still working. It doesn't take long to build your strength and endurance when you ride a lot.

The book "Cycling past 50" is a good source. However, I have found that almost all of the training guides in cycling magazines are geared to 20-30 year old, 135 lb cyclist.