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What is the reason that older males and females are able to have O Rh Positive...

What is the reason that older males and females are able to have O Rh Positive transfusion for emergency?

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O Rh positve blood is given in case of emergency situtaions when there is not enough time to perform routine blood bank testing. O Rh positive is given to trauma patients to avoid hemolytc transfusion reaction due to ABO incompatibility. O Rh positive blood can be given to people belonging to older age group because we are not born with antibodies against Rh positive blood. Its not safe to give O Rh positive blood to women in the child bearing age, but older individuals in emergency situations can be given O Rh positive blood until all required blood tests are performed.

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