...I am now gaming by osmosis.
I have watched and/or listened to my husband and son (and sometimes cousins / nephews / whoever is over here with a laptop at the time) play League of Legends so much, that I understood a parody song about the game (set to Katy Perry's "Roar"), and thought it was hilarious.
If you're not familiar, LoL is a "free" online MMPG. Free is in quotes because while it's possible to play without spending a dime, one apparently cannot have awesome characters -- and awesome skins for said characters -- unless one buys $30 worth of Riot Points (RP, in LoL-speak) every month.
I think I'm doing pretty good, for someone whose last regularly played video game was Mortal Kombat II (and I can *still* kick your ass with Raiden, Kung Lao, or Mileena :)
I'm also an expert at Super Mario Bros. 3 and Tetris. Go, me.