Just want to say, your comments on this subject are very well thought out. I agree that perception plays a huge part of the idea of older people playing what most today still consider a kids hobby. I'm not sure when that would change, like you stated probably only when that hobby stopped being a primarily viewed as childs pastime. Im in line with OPs apprehension on revealing that I'm a big gaming hobbiest and honestly leave out mentioning it until I know the person better. Even in other environments, like work for example, I normally don't list gaming as my primary hobby to others initially. I will say though I've seen upper management types start to even list gaming as a hobby now so I feel like some small progress has been made in pealing back the impression people have initially on gaming as an older person.
It's hard not to just pause and take in the ambiance at these spots