An elderly women is sitting in a chair on one side of a room with a group of musicians, including a cellist and guitar player, and on the other side of the room, a group of people are sitting on chairs.
She is over 80 years old.
An elderly woman may not be over 80 years old.
Just because it is an elderly woman does not mean she is over 80 years old.
Just because the woman is elderly does not mean she's 80 years old.