On the whole, cycling is a lot more forgiving of body type and age than running is.
http://us.rd.yahoo.com/dailynews/rss/search/cycling+racing/SIG=122ibd7te/*http%3A//www.nytimes.com/2007/07/17/health/nutrition/17essa.html
http://us.rd.yahoo.com/dailynews/rss/search/cycling+racing/SIG=122ibd7te/*http%3A//www.nytimes.com/2007/07/17/health/nutrition/17essa.html