Been playing the same save since I bought the game on it's release way back whenever it was.
If I get bored then I rotate or add a new sim or a bunch of new sims. As pretty much every sim in the game is now one of mine there is a consistent look and feel across the game.
Now if this was an RPG or an MMO then I have a serious case of restartitus or way too many alts. In FF14 I have to force myself not to do alts because you can do everything on one character. In EVE Online, so many alts!
I love character creators, and well, this game is the top dog there :)