That said, I don't quite understand how the internet supplies one with the type of enjoyment s/he would get from retirement. Retirement, in the traditional sense, means having some kind of freedom from financial burdens, for many, the ability to travel the world and see things, and time to do other things besides work.
The internet provides many kinds of information and entertainment, but I would never say that it's a substitute for traditional retirement. If you're stuck working a crappy job flipping burgers and spending the rest of your time doing things online, there's nothing wrong with that, but you're going to have to go a long way to convince me that this is a viable alternative to being free from work, able to travel where I want, etc.
I spent high school and college playing video games as well, and I've spent a lot of time online in my life (we got the internet back ~1996), but I see the internet as more of another thing among many things to do, and not really as the only thing there is to do. At the risk of sounding like an old man (I'm 31), I would say, don't underestimate the value of real-world experiences. Watching a YouTube video of a concert, for example, is nothing compared to being there... and even with all the crazy VR tech that will be here in the near future (or even now), we're still a long way away from replacing real experiences with virtual ones.
I'm not trying to say that you shouldn't be content with how things are though. If you like to spend time online doing things, and that's all you want to do, then by all means - have at it. Just adding my own two cents worth here. :)