It's not about retirement, it's about lack of competition. The fact Riegler, Pommegger, or Fischnaller are still active and in contention for medals at age 40+ tells me in ten years time Joerg and Hofmeister will be in the same bout. Hell, Dujmovits took two years off and she's back on the WC podum like she never retired to begin with.
The youth charge happens in other aspects of freestyle skiing, slopestyle, big air and all those events. Parallel slalom has to have the highest average age of competitors involved. This is like the geriatric home for seniors. And since those bad Russians are the only ones with some fresh talent this event will be willified by FIS and IOC for a little while yet.