What does the prostitute's old age say about Winston and his mother?

Winston's real mother who he has dreams of throughout the
book makes Winston feel like she died or was erased because of him. Her life paid for
the opportunity for his to remain. That sacrifice (although it is believed her death was
symbolic of the great Stalinistic purges) fills him with guilt and affection for her
even though his memory of her grows symbolically more faint throughout the
book.

Thus, the age of the prostitute (although it is not
specifically referred to in the book) might demonstrate a remembrance of his mother. The
episode with the prostitute is actually a flashback for Winston, much like a dream. You
could say this is an Oedipus Rex moment, but the light was off for most of the scene
with the prostitute. He makes it seem as if he didn't understand her age until it was
almost over, and then he just finished for the opportunity to have sex. This may
demonstrate a longing to have relationship with his mother, but that relationship he
wanted was likely appropriate. He may be recalling a time in life when sex was not used
to control people, but was used for pleasure.