Looking at old pictures, I feel like my lower dental arch+chin is more backwards than it used to be. I'm guessing extracted lower wisdom teeth play a role here (combined with letting my mandible hang). This makes sense, as teeth tend to move around. With the extra space in the back, it's possible for the teeth to move backwards in theory.
I'm curious about other people's experiences. I want this to be representative, so whether your answer is 'yes', 'no' or 'don't know' doesn't matter, the more replies the better.