It is important because there is people being prosecuted for selling Goldfish to buyers under the age of 16, a prime example of this was the pet shop keeper who was prosecuted for selling a Goldfish to a boy under 16.
I think a revue is required and the age limit reduced as I feel the age limit is too high in certain circumstances, obviously a child buying a spider or other dangerous like a crocadile would be deemed unsuitable but a Goldfish or hamster is recognisable as silly