Question about Persuasion by Jane Austen?

So I'm 16 and reading and Persuasion by Jane Austen, and they keep saying how Anne is not young and likley never to be married because she is old, but she's 27! 27 is young, i mean i know they married young in those days (Lydia in pride and prejudice married at 16 and Catherine Northanger Abbey married at 17) but i just find it really odd how they keep saying how she's old and past it yet she's still in her 20's. anyone else find this weird?