<p>17 with parental permission, 18 on your own.</p>
<p>I did it for the first time this year, at my high school, and was glad I did. both to get over my stupid fear of needles and because it's a good thing to do. I was literally shaking until I had a needle in my arm.</p>
<p>you have to be a certain height and weight for the platelet procedure though. I think girls have to be 5'5" or something. either way I was too short for it. (kinda glad too... sorry, it still freaks me out)</p>