The forties are a very interesting phase in life.
Well, let's start by saying that women largely marry for companionship and security while men primarily marry for sex and the physical allure of the woman they wish to make exclusively theirs. This explains why many men can stay in a childless marriage until they get to 40 and really panic. In the beginning they are very reassuring and unfaltering in their promise to be patient and stand by their spouses.