Even though full grown cats will act like kittens, and some may look like kittens their whole lives, it's easy to tell a kitten apart from a catdult- because kittens can't contain their frisky side.
Some catdults start acting like kittens after hitting the catnip, but they come down from their high pretty quickly, while kittens keep going and going and going until their batteries run out.
As we all know growing up can be a scary experience, and catdults look scary to a little kitten, so kittens should be encouraged to stay small and kitten-y for as long as possible.
See 19 Insanely Cute Kittens Who Just Don't Know Any Better here