By getting older, many people realize there is a better more important game that is called real life. When you play WoW with your friends and the boss drops an ultra weapon and you guys are happy as hell, I've to ask you guys, why? Why happy? Why happy about an virtual thing that costed so much time you can only use in a virtual world to getting even more addicted to a wrong world of fantasy and magic. This world is not real, but your life is.
In the main game of life you got an even harder challenge that involves your social proof, career, relationship- and sex-achievements. When you cross the 30s you might get a new aim, building an own family. Here we are, climbing up the pyramid of needs up to the top, the aim that is called the "self-realization", you never can reach in a virtual game.
Old people still play small games for fun, but MMORPGs inflict to much time waste in your real life. By getting stronger and stronger in the virtual game, it will give you more and more fun and thus reasons to stay in the game, this causes addiction and hurts the climbing on the pyramid of needs in your real life.
Start to build your life, in this game, you have only 1 life and no 'continue' after losing it.
Peace!