The age of a man is probably one of the major factors that can cause infertility and the decrease of sperm count or sperm motility. As males age, their perm count decreases and so does their fertility. And unlike any other factors, the effects of the aging process cannot be treated and men have to learn to accept the fact that as they age, their sperm count and motility will decrease significantly.
A man is born with all the sperm cells he can ever have and he can ejaculate as many times as he can and still produce sperm cells. But as they grow older, the quality and quantity of this ability declines. Studies have shown that after age 45, the decline of the quantity and quality of sperm cells becomes more rapid than those during the earlier ages. There is no magic number to define the boundaries of this decline but simple mathematics will show you that every year the man gets older and fertility gets lower than the year before at the later stages of adulthood.
And so if a man is contemplating on having kids, it’s best to do it sooner than later if he is in a stable and good relationship because doing it later might not be as fruitful. There are of course other issues that affect fertility in a man and these issues sometimes comes in proportion with the aging process. One issue that men should look into is the increase in weight and smoking. As men grow older, they become less active and do less exercise. This tendency can lead to an increase in weight. Smoking has been known to be a major cause of decline in the quantity and quality of sperm cells and a lot of men develop the habit of smoking as they age.