There is a lot of research into the lower levels of Testosterone, sperm and sperm activity in younger men. Guys my age (mid 50s) are showing about half the levels our grandfathers had and guys in their twenties are showing half THAT level. The causes seem to be environmental and you can google this for yourself. In theory, this should DECREASE hair loss in younger men but it seems to have the opposite effect. If you are male, or love someone who is, there is reason for concern here.