I was trying to catch up on some reading over the last few days and came across this in the Journal of Strength and Conditioning Research (the November 2006 issue): A study says "older men can complete a high-intensity resistance exercise program resulting in spikes in testosterone that may attenuate age-related muscle and bone mineral density loss." The testosterone spike from heavy lifting, something approaching 80% of the one-rep max, was similar for young, middle-aged and older men.
So go lift some heavy weights.
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