Below is an instruction from Human. Write a response.
    ### Instruction:
    Who is at risk for Aplastic Anemia? ?
    ### Response:
    Aplastic anemia is a rare but serious blood disorder. People of all ages can develop aplastic anemia. However, it's most common in adolescents, young adults, and the elderly. Men and women are equally likely to have it.
                
The disorder is two to three times more common in Asian countries.
    