I'm only 14 as of now, joined these forums when I was 13 (Almost 600 days ago, from now!)
I have been told by lot of people I am mature for my age. I keep my lasers to myself, I dont go handing them out to people (Unless they are in my house, so there is no chance of anyone else being hit by it)
If I am using my projector on tree's outside, I monitor ALL the lights in the sky. If one appears to be flashing, then I immediately shut it off etc. I know the flight paths of all the planes around here, and what i can do and what I cant.
Not to be "bragging" or anything, and I do agree, the longer you have been living on this here earth, the more knowledge you gain, but for people to be going "You shouldnt have that laser you baby" or something like that annoys me.
I doubt anyone here would realize how many underage members there are here (apart rom teh on wiht relly bad speling and gramer) if no one told their age.
Then again, there is ALOT of stupid comments on youtube, and just plain idiots lined around the place, not really much you can do about them except mark their comments as spam, or delete comments all together.
The worst part is when people go "Shut up, I am older than j00, so i know more", which in alot of cases is total crap. I just tend to ignore that kinda stuff anyway, you can do the same on YouTube if it bothers you
EDIT: Not that I would call people underage anyway, more like "younger members", theres not many restrictions on how old you need to be to post on a forum like this.