A ten-year old girl falls out of a tree and scrapes her knee.  Many
years later, the same (in the conventional sense of the word) woman
has grown old.  As she rocks in her chair, she thinks fondly of the
tree escapade so many years ago.  The woman's memory is good, her mind
is sharp, and she has undergone no surgery -- in short, she has had a
very normal, prototypical life (by 20th century standards).

Is the old woman the same person as the girl?  Put another way, has
the girl survived to the old woman's time?  [It may seem an obvious
question, but great errors may be made by neglecting the obvious!]