what age does sperm production decrease
In many parts of the world, scientists and fertility doctors are noticing a drop in sperm count and sperm motility (sperm movement), which make it harder for couples to have babies. A recent study in France, for example, estimated that for a 35-year-old man, sperm concentration dropped from 73.6 million per milliliter in January 1989 to 49.9 million/ml in December 2005. Here are some of the possible causes of this phenomenon: