Re: Han Solo...(Possible Spoilers)
I really hate the idea that only young people can star in movies.
I don't think that's the case at all. But I do understand studios 'playing the percentages' by casting younger actors as the central characters when building a movie series that could conceivably run ten to fifteen years.
We're all fragile, but the younger you are the less likely you are to 'expire' or run into an affliction that could complicate the process.
"...the most elementary and valuable statement in science, the beginning of wisdom, is I do not know." - Lt. Commander Data, "Where Silence Has Lease"