I love Donald Glover, but I would prefer the teens to be played by actual young people, very early 20s at the oldest (also, I really don't see him as Alex). The 30-year-olds-playing-teens thing is a pet peeve of mine. I'm sure there are enough talented younger actors around that there is no real need to cast adults who are approaching 30 to play teenagers. It's one thing if it's a guilty pleasure like Pretty Little Liars (where it's fun to laugh at the fact that some of the "teens" are older than the teachers), but I'd want to take a Runaways movie a little more seriously.