Jerry Kennard wrote an article discussing How Male Fertility Declines With Age. The article goes on to Discuss Age and Male Fertility.

  • It takes longer: If a man is over and the woman is under 25, it can take about two years to get pregnant. On the other hand, if both partners are under 25, it takes just over 4.5 months, on average.
  • In vitro fertilization (IVF) becomes more challenging: The risk of not having a baby after IVF is more than five times higher if the male partner is 41 years old or older.
  • Semen volume decreases with age: The amount of semen a man produces, as well as the sperm's ability to move towards an egg, decreases continually starting at the age of 20.
  • There's a higher risk of miscarriage: Believe it or not, a father's age can even impact the likelihood of the baby surviving in the womb. The risk of the woman having a miscarriage is twice as high with a male partner over the age of 45 as it is with a male partner under 25.
  • Autism risk increases: Children fathered by men older than 40 are more than five times as likely to have an autism spectrum disorder than those fathered by men under 30.

  • If a man is over 45 years old, it can take five times as long to conceive as for a man under 25.

    If one of the components of post wall age is fertility window, wouldn't it be fair to say the there is a post wall age for men as well? Maybe 40 yrs old.