Can you donate blood if you have a tattoo?
Yes, but this is tricky, so be sure to get it right before you go. Due to hepatitis-related concerns, in the United States you cannot donate blood within 12 months of getting a tattoo if your state does not regulate tattoo facilities. (States that do not include Washington D.C., GA, ID, MD, MA, NV, NH, NY, PA, UT and WY.) Tattoos done in all other states -- so long as they were applied in licensed establishments using sterile needles and ink that was not reused -- are fine. If you have questions, always ask the folks taking your information when you give blood.
How old do you have to be to donate blood?
At least 17 years old, or 16 with the consent of a parent or guardian. There's also no age limit to stop giving blood, as long as you're healthy enough to lose a pint at a time.