Zack Snyder's Justice League is chaptered into a prologue, six parts, and an epilogue. Think of it as like a comic book limited series compiled into a cinematic trade paperback. The plot never feels meandering and all the characterization along the way pays off in the drama of the epic final battle. By the end, nothing in the film feels extraneous, except maybe the long epilogue which largely sets-up originally planned sequels. Zack Snyder does not make your typical superhero movies. While those can be very enjoyable and fun, Snyder takes superheroes to a whole other level of art. I am absolutely certain Zack Snyder's Justice League will be remembered as a cinematic masterpiece.
To maximize your Justice League experience, I suggest at least (re)watching Batman v Superman: Dawn of Justice (Ultimate Edition) before it, but for the full effect also (re)watch Man of Steel first. If SZ's JL is too much for you to binge in one sitting, then break it down into parts. (Between Parts 3 and 4 is a good break point for watching the film in two sittings.) HBO Max has a lot of these films (and a whole lot more), which is available to subscribe on a monthly basis.
Parental Guidance: Some of the action scenes are bit more violent than most superhero films, with a bit of (mostly alien) gore. There are a few occurrences of profanity. But I think most 13 year-olds would probably be ok with watching this movie.
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