There's a chance we may get to see an older Spencer Cassadine soon.
Yes, it looks as though Nikolas Cassadine's rarely-seen son may go the route of Michael Corinthos and Kristina Davis, Alexis' daughter with Sonny, and get the SORAS (soap opera rapidly aging syndrome) treatment soon.
These SORAS moves could be an attempt to pull in some new, younger viewers. It's a good idea to do that, but General Hospital would be well-advised to attempt to keep their long-time viewers instead of thinking there are an endless supply of new ones. According to the latest ratings, GH has lost some footing. In fact, ratings are lower than they have been in a long time.