Elizabeth Bennet is 20 in the novel Pride and Prejudice.
From the novel:
Lady Catherine seemed quite astonished at not receiving a direct answer;
and Elizabeth suspected herself to be the first creature who had ever
dared to trifle with so much dignified impertinence.
"You cannot be more than twenty, I am sure, therefore you need not
conceal your age."
conceal your age."
"I am not one-and-twenty."
