You are never too old for toys! ^^
Plus, bear in mind this is a Tamagotchi Forum, where most people would probably say we are too old for them - but are we? No! Therefore, there is the answer, if we aren't too old for Tamagotchis, we aren't really too old for any other kind of toy. Just because it is aimed at the youngest crowd does not mean that the rest of us cannot like them or play with them.