Contrary to a couple of posts in here I believe you will find the average age of people playing TOR will be in the 40's. I am 47 myself and have played mmo's for about 10 years now. Even the Demographics of your Star Wars fanatics today will support this age range.
By now most of the young people have moved on to something more in line with their own generation. They grew up with Wow being the main MMO in their generation.
With the totally original way Bioware tells their story you would be hard pressed to find a young person willing to sit and watch the story unfold the way it does in this game. Most are impatient and would race to the level cap and be the first at everything under the sun.
To really enjoy this game you need a laid back attitude and the willingness to slow things down and smell the roses while you are leveling. That's where this game is at its best.