I know a couple of middle-aged plus people who are superfit and skate and ski respectively who swear by yoga. I think if done properly it will help with anything. To skate well requires a lot of core strength and body control. I do pilates myself, find it incredibly helpful as a preparation for skating or indeed any sport.
I wasn't any close to a spread eagle when I first tried, now I find them easy (at least the bent leg ones). And I'm an old codger really, so I think it's entirely within most people's reach to get a stable spread eagle.