Wow, another 10 year age diff. That has to be a good indicator of marital stability (or the lack of).
People do change. My wife is definitely not the same woman I married, and neither am I. But a lot of the traits I had back then, I still have (for better or worse). Same with her.
Don't let her blame you for everything that is wrong. That's WAS syndrome. You both own 50% of what happened in your M.