League of Legends and Infinite Crisis and Heroes of Newerth and you don't understand. You aren't clear on what stuff like jungling and lanes are all about. Are you getting old? Well, yes, if you're referring to a group of people as "the kids" you almost certainly are. But you also might just not understand the history of MOBAs as a genre, a history helpfully outlined in an article on the genre from inception to the present.
The article traces the genre's genesis back to the earliest form of gameplay found in StarCraft's Aeon of Strife map, which paved the way for a Warcraft III map that expanded the same basic concept. The genre's core conceits -- two bases on either side of the map, players working to push to the other side -- have remained fairly fixed through the various permutations, but there's still room for expansion. So if you want to find out more about what this new-fangled genre is all about, sit down for some reading.