I remember being 13 and desperately wanting a Tarot deck; the problem was that in my household, children didn't get allowance, and so I had no way of actually getting my hands on one, despite being old enough to get myself to the store.
I got my first deck at 15, when a friend of my mother's friend got wind of how badly I'd wanted one (she was wiccan; she got me the RWS). The problem was, I'd had my heart set on a Visconti-Sforza. I tried really hard to learn the RWS and 15, but the imagery put me off for almost a decade. Now I'm a professional reader, but I'd be such a better one if I'd had a deck that I'd connected with in that intervening decade.
Kids are smart enough to know their own interests. It's adults who screw it up.