I don't have a Century training plan. I just ride. When weather improves I will do a few 30 to 40 milers a week and get in the odd Metric as they come up so that can get me a couple of fast or extra hilly rides on the 30 to 40's and around 50 to 60 at the weekends. Mind you I will "Train" to get that mileage in a week and will start with flat 30 milers twice a week and 40 at the weekends. These miles will increase rapidly if the weather is right so looks like April before I start getting in over 100 a week.
As it is right now-I am only doing a hilly 30 miler a week but 3 gym sessions are just keeping me in trim. Last year I did an organised 60 miler that I extended to 100 by extra riding and that was from a very base level. It hurt but I doubt I had done more than 50 miles a week up till then.
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How long was I in the army? Five foot seven.
Spike Milligan