If you have problems with your wisdom teeth, you get them removed. If you don't have problems, you don't get them removed. I am one of the few who have all my wisdom teeth. Never had a problem with them, so why get them taken out?
I think it has a lot to do with the root system of each tooth. Sometimes the roots can interfere with other teeth, or affect the jaw bone negatively. X-rays should be able to set things straight once they have completely grown in.
My father still has his and he is forty something they never came in and I'm fifteen i don't have mine and i wouldn't have room any way I'm glad my group of molars (not counting the wisdom ones) hasn't come in because i wouldn't be able to close my jaw. so don't fret it may happen it may not don't worry just roll with life's punches