Multiple factors...: Lower testosterone, lower nitric oxide levels, and probable vascular hardening/dysfunction--all occur with age. With age, your "north pointing flag" begins pointing a bit more southerly due to declines in the above. In animal studies, removal of testicles (lowering of testosterone) results in impaired erections. Testosterone replacement reverses this. Testosterone levels lower with age.
Answered 1/8/2016
2k views
Normal: Probably nature's way of telling us that we've had our chance. Now make way for the next generation. Read Charles Darwin's works and Stephen J Gould's work's.
Answered 3/28/2016
1.5k views
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