def METHOD_NAME(age):
    global AGE_ADULT
    global AGE_CHILD
    global AGE_ELDERLY
    global AGE_NOT_SURE
    global AGE_STRING_ADULT
    global AGE_STRING_CHILD
    global AGE_STRING_ELDERLY
    global AGE_STRING_UNSURE
    if age is None:
        return age
    if age == AGE_CHILD:
        return AGE_STRING_CHILD
    if age == AGE_ADULT:
        return AGE_STRING_ADULT
    if age == AGE_ELDERLY:
        return AGE_STRING_ELDERLY
    return AGE_STRING_UNSURE