That's not really the point, though, is it?

Everyone who has studied or read about relativity struggles with these problems. (I challenge anyone to disagree with that!)

In theory, the minutest difference in speed will result in a change to the time-frame. Likewise, my head is normally further from the centre of the earth than my feet are - so should my head be younger than my toes due to gravitational differences?

In practice, of course, these are immeasurable differences and if my head is connected to my toes in the past, it's not going to change the fact that my head only experiences my toes in the past anyway.

I hope you get some better answers than these :)