Do you weigh more than 110 pounds? In good general health? Have current photo ID? Then donating blood may be in the cards for you.
With a parent's consent you can begin donating at age 16. Don't expect a shiny medal, a badge touting accomplishment, or even your peers to be congratulatory. At best, you may get a certificate, or "pat on the back" for an unselfish gesture towards community service.