Far as I can see your real concern is about irresponsible breeding. That's not determined by age really. I would bet that most bad backyard breeders/puppy mills are run primarily by adults who ought to know better but don't care. I think a good breeder whether they own a kennel or are a smaller home based breeder can be any age as long as they know their breed and make responsible decisions for the proposed puppies. Bad breeders can be any age too. We see that here in this forum...excellent, concerned owners/breeders of snakes that are of all ages...and idiots of all ages. It's really not fair to bring age into something that isn't all that influenced by the years you have on this earth.