Creating a future regen question

[trviggo]

The file I added my future regens in has since been replaced (presumably due to multiple updates), which makes me wonder if I'll still get my future regens or not? I was under the impression that information is locked in and stored from save creation, but think I should've got him by now in game. Since the file has been replaced I can't go and double check the exact year he was supposed to generate it.

If it did fail to generate him, there's no way to add him in once the save has already been started right?