According to Reuters, Dr. Thomas Travison and colleagues from the New England Research Institutes in Watertown, Massachusetts found that men's testosterone levels have been declining 1% annually for 20 years. They are at a loss to explain the cause.
Didn't statins start to gain a foothold 20 years ago?
Yes, Lovastatin was first marketed in 1987:
(http://en.wikipedia.org/wiki/Lovastatin)