How old do you have to be to have white sperm?
Sperm is always white. You're semen turns white after maturity. During maturity it is clear due to there not being much sperm in it.
Semen is naturally clear. The white that you see is actually the sperm in the semen. Semen is the carrier of sperm and allows them to travel through the vaginal cavity. When males of age start tobproduce sperm, the sperm is then added to the semen; turning it white. If your ejaculate (semen, sperm, whatever you call it) isn't white, it means that you are not mature enough to produce sperm.
It means you're old enough to get a girl pregnant, or you have a sexually-transmitted disease (STD). If the "goo" is white or white and clear, and dries to a white powder, it's semen mixed with sperm. If you have not been masturbating, it is just your body's way of getting rid of excess sperm. If it is yellow or reddish (i.e., mixed with blood), see a doctor.
After trying for a year to conceive this man only had one functioning testicle and no white in his sperm do you think he is sterile?
Sperm cells are microscopic and cannot be seen with the naked eye. If you are asking about semen, which is a fluid mixture containing sperm, the color is usually a mixture of white and clear. The clear part is where the sperm cells are located. If a man has had a vasectomy, he will ejaculate semen that is almost all white, with no clear parts.