As I am a fan of almost all things superhero related (in addition to the processes here), I happened upon a new show on hulu. Its about the son (who sucks for the most part) of a great superhero trying to put together a new team to replace his retired father's old team. At one point he and his recruits end up at an old folks home and see two old women who used to be arch enemies fighting it out. The end result is that they end up as 25 year olds again. Her reaction is rather humorous and she keeps her old lady voice. I imagine the series will have her old again at some point. There isn't any process, just a flash and offscreen change, but I thought it worth it. Start at the 20:00 mark or just watch the whole thing, its not bad, clichéd and unoriginal though it may be.