We could say that it is an example of Irony, or Sarcasm, or Oxymoron. That's because there is no philosophic dignities in people of twenty four as they are not yet wise and mature like older men.
Http://www.shmoop.com/hunger-games/chapter-6-summary.html
In a neat literary twist, Elizabeth's positive qualities are also her negative ones. She is a virtuous woman who is steadfast and true—but these traits also make her a bit of a cold fish. When we first meet her, she's especially cold...and thinks she smells something fishy.<span> She's got good reason to be suspicious and kind of distant, though: her husband has recently had an affair with their housekeeper, Abigail Williams.</span>