4 ms·

Not clear if you meant that you'd be donating for yourself, but blood only lasts 42 days (plasma lasts up to a year): http://nybloodcenter.org/donate-blood/beco

• kaybe 12y ago
  No, I meant that the young people donate for the old, and that once they turn old there will (hopefully) be more young people to donate blood, again to receive blood from other young people when they turn old. Kind of like a pension scheme (at least the one we have in Germany works that way).