I don't think the same way or have the same tastes as I did when I was 5. Or 10, or 15, or maybe even 30. But I'm still the same person... am I? My Social Security number thinks I am. How much do things change before you think of yourself almost as a different person? Are the changes all in you, or do you change with your environment? I moved 6,000 miles to be where I am now. I don't think I think the same way I did, and I don't think I behave the same way. Was that me, or things around me? Is this a question that can be answered with philosophy? If it is or isn't, is it a question worth answering and is there any utility in knowing the answer?