Here are some ideas that terri posted on our covens forum boards.
"things for a donor to consider:
having a tetanus is always a good start. as a child you should have one but you will also need a re-boost at the age of 14. its always best to have one every 6-8 years.
get yourself checked out every 6-8 months. blood diseases, though uncommon can be transmitted very easily and can be potential life threatening.
infection are another risk. make sure that the wound is clean after the feeding and that you treat it with creams and keep it clean.
things for the vampire to consider:
its not just the donor who needs to be -*test*-('")ed. blood deseases can be transmitted both ways, so always make sure your clean.
check your equipment before each use, make sure it is fully sterile as you can pass on diseases with dodgy equipment.
make sure your donor is getting checked out regally. this is a partnership so you will be trusting each other with your health.
make sure that you two communicate. issues such as little infections such as a cold, up to your sexual histories should be out on the table.
if you have more then one donor you should always be honest with them. dont lie about how many others you have, if you have them. its polite and necessary for each donor to know who else you are taking from. they are putting their health in your hands so give them a bit of respect.
aftercare:
make sure that you dont just leave your donor after feeding. offer them food, especially chocolate as they might be feeling light headed and they will need to bing their blood sugar level back up to normal.
make sure you dress the wound correctly and cleanly.
make the donor feel comfortable at all times. its never good for either of you to feel uneasy during feeding."
As for age, you can give blood at 17 on the NHS.
I believe that if the vampire is 18 or over then the donor should be too, or a few months under.
For the minors, donors are hard to come by. So donors for them should be there own ages and all safety measures and precautions considered.
I shall included this kind of detail in my articles, which i hope to have done by half way through december. being a student means a busy life
and my subjects at college require attention first and effort. These articles howver I could write in my sleep, it's just finding time

GD