Body Piercing is a service provided by trained and qualified professionals in a controlled environment using only sterilized materials and bio-compatible body jewellery designed for specific piercings. This is site is not designed or intended to provide users with "how to information" that could cause serious injury to themselves or others from the use of posted information. See a professional body piercer for all your piercings.
That can vary from male to female.
A properly placed nipple piercing goes halfway down the nipple. You DO NOT pierce the areola, nor do you pierce close to the tip. Of course, this rationale is for normally sized nipples, because unfortunately some piercers pierce nipples that were never meant to be pierced. Go to a professional and have them evaluate it for you.
Until a woman is 18, it is illegal for a shop to do a nipple piercing on her. For men it's not illegal as far as I know, but most piercing studios will not pierce someone under 16, others may refuse to do nipple piercings on a male under 18.
Nipple piercing is not only for the look of the piercing but also for personal stimulation, once healed nipple piercings can be quite erotic and will add sensation when the right jewellery is in the piercings.
If the nipple is large enough, then it is possible to pierce one nipple twice in the same direction. I would suggest you talk to your local professional body piercer, they can have a look and tell you if there is enough tissue to support a second piercing.
Provided it was done properly and it is deep enough, it shouldn't reject and should last for as long as you want it.
No
You can't, & any place willing to pierce you underage isn't someplace you should be willing to trust. They're already displaying no regard for the law. How sure can you be that they don't reuse needles?
Yes you can pierce a nipple but remember that Body piercing should be performed by a qualified piercer in a clean sterile environment. You do not want to do damage to your body or risk infection so seek the expertize of a fully trained and qualified piercer. Also read up on the risks of piercing your nipples and if you are pregnant or are thinking of getting pregnant. Elayne Angel has a great book on this called the piercing Bible. If you are pregnant DO NOT get pierced anywhere your hormones are changing to rapidly.
if younger or the gal's skin is kinda white should be pink, with time goes buy would be light brown, but some of are deep color.
Should be 43" from nipple to nipple....
Any noticeable change in the nipple area should be checked by a doctor.