In the movie, Valerian and the City of a Thousand Planets (2017), Valerian has the rank of major and Laureline is a sergeant. Yet, they seem so young. Is it just that the intended audience is younger, so younger actors were chosen to identify with?
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1They're way behind Ender from Ender's Game. Just sayin'. – BrettFromLA Nov 7 '17 at 20:12
If the ranking system is the same in the future, major and sergeant aren't that high up. And age isn't really a factor so much as your ability to handle the privileges and responsibilities of the rank.
Clearly Valarian and Lauralene earned their ranks.