typedef enum XTF_USER_AGE_GROUP    
{  
    XTF_USER_AGE_GROUP_UNKNOWN = 0,
    XTF_USER_AGE_GROUP_ADULT = ( XTF_USER_AGE_GROUP_UNKNOWN + 1 ) ,
    XTF_USER_AGE_GROUP_TEEN = ( XTF_USER_AGE_GROUP_ADULT + 1 ) ,
    XTF_USER_AGE_GROUP_CHILD = ( XTF_USER_AGE_GROUP_TEEN + 1 ) 
} XTF_USER_AGE_GROUP