Conflicting evidence about the extent to which men’s semen quality declines with age — likely lowering their fertility — is being cleared up by new research that has collated and reviewed data from 90 previous studies from around the world.
Conflicting evidence about the extent to which men’s semen quality declines with age — likely lowering their fertility — is being cleared up by new research that has collated and reviewed data from 90 previous studies from around the world.