Is the average age of 44 really skewed ? If we think about who would be candidates for drug testing, I'd guess that the minimum age allowable would be say 18 and the maximum probably 60. Assuming these parameters then this would give a theoretical average tester age of 39. If the maximum age was 65 then the theoretical average would be 42.5yrs. As people have a tendency to get fatter as they get older this would put a natural skew on the mean age of the testing candidates, so a mean age of 44 doesn't sound artificially selected to me.
I think you might be unduly sceptical on this point
Cheers Zinc
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