Over a lifetime all of us change to an extraordinary degree, from the physical perspective. we start off as a bundle about 50 centimeters high, with cherubic features and elastic soft skin , and then we may end up some 90years later as a stopped, gray , liver -spotted, 180- centimeter high structure. In the intervening period every single cell in our body will have been replaced. Often many times over, and we'll have gone through all kind of experiences that perhaps leave most no trace in memory. The twenty -five year old won't remember most of what the five-year old felt so strongly about. The sixty seven years old will only dimply recall what was on their mind as they approached 30. We carry the same name throughout our lives, and consider ourselves as a relatively stable unitary entity, but is it really right to think of ourselves as the same person?.
Once you put its under a philosophical microscope the issue of personal identity emerges as far trickier than as first assumed. So in what could we be said to be continuous throughout time? what does guarantee that we can possibly think of ourselves as the same people over a lifetime? just where is personal identity located. A standard assumption is that its our body that guarantees our personal identity This is the theory a key part of what makes me 'ME' is that i am housed in an identical body, but philosophers like to push this assumption around a little. Imagine if I lost all my hair.
would I still be me?
Yes, sure..
What if i lost a finger?
Yes!!!
What if a malevolent demon appeared, and told us that we had have to lose every part of our bodies, but could keep just one bit...... would it be few of us would pick our elbow , or belly button .almost all of us would pick our brains and that tells us something interesting.
We assume, implicitly, that some bits of our bodies are more 'me'ish closer to the core of personal identity than others, and the most 'me'ish all the bits are our brains.