You have like zero molecules left in your body from 10 years ago. If you are worried about physics, the most important consideration is your diet.

And are you really a derivation of your state, or of the things that happen to you? The guys who were drafted into war in Vietnam and then got killed there, was there anything about them that would have made a difference to their cruel fate? If we go by this philosophy, the most import decisions are when you were born, where, and into what environment.

For example if you want a house, you should have timed your birth to 30 years ago.