Most stories, be it books, movies, TV series, etc, have their characters progress, grow older, grow as characters, and eventually pass on their knowledge and such to the next generation.
Comics however, have become notorious for refusing to allow characters to grow/age. Almost as much as Pokemon for keeping Ash Ketchum 10 years old for over 20 years.
So, do you think that characters should be able to grow old and pass the mantle on (or at least experiment with it), or keep everything "static", so to speak?