Is it possible for a man's semen to lose "potency" as he ages and due

Question:

Is it possible for a man's semen to lose "potency" as he ages and due to alcoholism?

Specifically, I mean can the traits/ genetics thet he'd pass along to his offspring be altered as he gets older and if he was a heavy alcoholic? Someone I know has several older siblings with dark features. He and his younger brother have light features. He says his dad was "less potent"
(whatever that means- his words) as he got older and thats why he and his brother are light skinned. Does this make since to you? I'm most curious about eye and skin color.

Best Answer - Chosen by Asker: No, that's false. Think about it this way...your friend being a male dispels his own statements all by itself. The mother carries XX chromosomes to determine gender. The father carries XY chromosomes to determine gender. The only way your friend and his brother are male is specifically because his father passed along the Y and not the X.

With regard to physical traits: One in four children will pick up a recessive gene. The other three will pick up the dominant gene from the other parent. The traits are still carried, but they don't fully develop. Several things can alter the color of the skin, giving someone light features, not the least of which being their diet and the amount of exposure they have to the sun. Other factors include a toning down of the pigment's intensity because the two sets of genes passed by the parents temper each other. That's why a dark-skinned African American father can have several different skin tones among the children he parents with a light-skinned woman.

Eye color is never stagnant and passed in whole to a child. My mother's eyes were very dark brown. My father's eyes were very pale green. I have hazel eyes that are gold and green. My oldest brother had dark eyes. My younger brother has green eyes. My sister has grey eyes...that came from a grandparent.

A man's semen can lose potency as far as its ability to swim well and live in the hostile reproductive tract of the woman long enough to fertilize an egg. But the traits programmed into the genes carried in the sperm don't mutate like that.