I'm trying to jump on here with the New 52, but it seems pretty catered to existing fans, so here are my questions:
1. What is this event that caused a bunch of Legionairres to die and how was Mon-El involved?
2. Who is Oaa? There seems to be no page on the site.
3. Is there a back history to the Daxamites in the 31st century? What's with the quarantine?
4. Do all members still need to be teenagers? They don't look it in the book. Hell, Star "Boy" has a full beard.
I'll be honest, I've been been interested but avoiding this for years due to nearly everyone having such original names involving -boy, -girl, -lad and -lass. I read #1 and #2 at least three times and did a little CV searching to narrow these questions down to the four above.
1. The event that caused the apparent death of those Legionnaires has not been revealed yet. Check out Legion Lost to see what happened to them. I'm hoping it's revealed in the Zero issue in September.
2. This was answered before. That's the real name of Variable Lad, one of the Legion Academy students. He sacrificed himself to save the others. He's also the nephew of the Legion's doctor, Dr. Gym'll.
3. The Daxamites pretty much kept to themselves (because of the fear of lead poisoning) until Darkseid took over the planet in the Great Darkness Saga. After that, people don't tend to trust them like they used to. Other than Mon-El, there are two other Daxamites who've been involved with the Legion. Ol-Vir, who worshipped Darkseid and joined the Legion of Super-Villains, and the Renegade who the Legion fought in the early issues of the New 52.
4. Most of the long time members are at least in their late 20's. The newer members who graduated from the Academy (Chemical Kid, Glorith, and Dragonwing) are still teenagers. Comet Queen is probably early 20's, and an exception was probably made to let her join. Historically, they've had the rule that all new members must be under the age of 18. But they have made exceptions to the rule before, such as Polar Boy and apparently Harmonia.
I hope this helps. I've been reading the Legion since the 70's and love them. If you have any questions, I will be glad to answer them.