"Altered beyond his knowledge." Anne fully submitted, in silent, deep mortification. Doubtless it was so, and she could take no revenge, for he was not altered, or not for the worse. She had already acknowledged it to herself, and she could not think differently, let him think of her as he would. No: the years which had destroyed her youth and bloom had only given him a more glowing, manly, open look, in no respect lessening his personal advantages. She had seen the same Frederick Wentworth. (7.34)
Just like any movie where a 50 (or 60, or 70)-something -year-old guy is paired with a 20-something girl, the aging process is viewed very differently, depending on whether the person getting older is male or female. Compare, too, Sir Walter's views on beauty: he seems to think himself still handsome, while he criticizes Anne and Mary for looking old.