40 years old men still have procreate ability?

They still can, but there is a lesser chance as production goes downhill, just like when women stop producing and go into menopause. I think the peek for making babies was somewhere around 25-35 years of age. If you still don't see any results in a couple of months, go to the doctor and see if everything is in order with the both of you. Also consider IVF or donor sperm if need be.