I'm not even sure what the concept of "person" means anymore. Am I in the same body? Not really, most cells have been replaced by newer ones. Am I taking relatively the same volume and shape in space? Yes, my body, despite all the new cells, still looks more-or-less the same (bar the gray hair and other changes). Am I the same "I" and "me" I used to call myself? I don't even know if my memories are completely accurate to see if how I thought of myself in the past is the same as now. And I've been wondering who's the person that says/thinks these things (like in this comment) for over a decade now...

I might be just a super advanced neural net (like a language model) with self-reflection and so many self-doubts.