Man it's pretty crazy that a lot of people on here have moved around so much from state to state or country to country, I would say that's not really the norm.
I personally have no qualms with living in my area for the rest of my life. It's what I know I enjoy the comfort in that. All my family and all my friends are here, I'm extremly content with it.
I understand why people would move though. It def loses it's luster when you get older you feel like your really not a part of the town anyway. The pulse of the town is lost on you, you know longer galavant around all the time and hangout at the local spots.
You usually wake up go to work get off come home watch a game and on the weekends you'll go to bars or whatever that is most likely not in you neighborhood. So you really don't experience the town the same way as when your young. All the memories of your town were etched in your head from days gone by.