Continuity mistake: When Mr. Collins introduces himself to Mr. Darcy, Mary is behind them, talking to her parents. However, you can hear Mary singing at the piano (in the next room) at the same time, and then go on to see her there in the next scene. (00:40:20)

Pride & Prejudice (2005)
Trailers
Directed by: Joe Wright
Starring: Donald Sutherland, Keira Knightley, Rosamund Pike, Jena Malone, Brenda Blethyn, Matthew Macfadyen, Talulah Riley





Answer: According to the book, at the beginning, Jane 22, Elizabeth 20, Mary between Elizabeth and Kitty so 18 or 19, Kitty 17, Lydia 15.
Myridon