I have been cycling for a few months on and off, mainly on a hybrid bike that I bought last year. Just this month I purchased a road bike and have stepped up the rides. It has been really helpful forming an informal cycling club with some friends, we are going out for regular rides and it has really helped motivate me as well as increase the mileage. Have even been doing 30-40 mile rides both days of the weekend now.
Still a long way to go before I can handle the 100 miles but if I can show half the strength my wife has in dealing with her chemotherapy and leukaemia then I will breeze it!