There are a few people who are actually 17,18,19. A lot of people seem to forget that "and over" part. Nothing stops the 18 -25 year olds from competing against your friend in adults.
I also am against Adult group because I think if there were more older people actaully competing in And overs it would become less of a throw away group and dancers wouldn't think they have to stop dancing at 18 or be considered abnormal. You can't ask for a special catorgory and the demand to be treated like everyone else. You've already asked for special treatment.