yes that is why they have fertility treatments
No. Besides a boy HAS to produce sperms. There is no such thing as a boy who doesn't produce sperms.
yes
no
If he has a testicle, there will be sperm.
You will continue to produce sperm your whole life you usually start producing sperm when you hit puberty and beyond.
No
No, their body isn't mature enough. Guys usually don't produce sperm until puberty. 10-17
Around your mid 12. During Puberty a boy will start to produce sperm.
The only way that would be possible is if the sperm entered into the vagina. If the underwear was moved away from the vagina at anytime that the boy ejaculated or after and the sperm entered, than yea, it is possible. If there is absolutely no way that the sperm entered the vagina, then the answer would be no. Your call, we were not there.
You can't really do anything to produce fast sperm. It all depends on your wife's ovulation schedule as to when she might get pregnant. You can try at home ovulation kits, they might help you get an idea as to when the best time for your wife to get pregnant is. As far as if you are trying for a girl or boy keep in mind the "slow" sperm you produce is stronger and equals girl where as the "fast" sperm is weaker and will produce a boy.
No. To get pregnant, there needs to be sperm and and egg. Eggs come from girls and sperm from boys.
13 year old boys can produce sperm.