I was extremely lucky and got Internet access in 1990 (pre-web) when I was myself 12 years old. I was entirely conscious of the fact that if the adults figured out that I was 12, I was dead meat. They wouldn't listen to a thing I had to say, and wouldn't feel the need to defend their claims against any argument from me. So, I spoke well. It's not all that hard to do. As such, I can't recall a single time I was ever called out. When I did on occasion choose to reveal my age, I often encountered disbelief, but by then it was usually after I'd already won them over so they could overcome their bigotry. And that's really what it is, I've realized in the years since. It's just simple 'they're not like me, any difference must be negative, it must be rooted in what they are and insurmountable, I will always be above them' bigotry. Despite the clear fact that if a 12 year old is taught to install a kitchen sink, something I'm sure anyone could see as possible, then clearly they'd be superior to most adults who don't know how to install kitchen sinks. So why is anything else different?