Quote Originally Posted by Jandor View Post
The Simpsons doesn't have a long continuous main story though.
But the Simpsons does have periods of time that pass.
The Simpsons have experienced several 'birthday's and several christmasses, but they don't age.

This is no different, as Iscah explained.
Time passes, but the calendar year remains the same, and the NPC's don't age.