Sebastian Faulks said this quote
“ Levade had told her one day that there was no such thing as a coherent personality. When you are forty you have no cell in your body that you had at eighteen. It was the same, he said, with your character. Memory is the only thing that binds you to earlier selves; for the rest, you become an entirely different being every decade or so, sloughing off the old persona, renewing and moving on. You are not who you were, he told her, nor who you will be. ”