It took me a long time to realize that nobody is always at his or her peak. To keep up with the youngsters, we old timers have got to work smarter not harder. That means giving yourself some recovery time with easier rides and/or alternative aerobic activities in the fall in early winter (might also be a good time for some weight training). Then build back gradually to your cycling peak. By June and July, you'll be kicking butts and taking names.
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"Light it up, Popo." --Levi Leipheimer