Unfortunately I need to change my vote, I was one of the "currently alive 0-6 months" and this is no longer true. Mine jumped out of the tank on Saturday, he had just passed the 6 months mark.
What's incredible is that he was able to fit through the eggcrate cover I have on the tank which was supposed to reduce the carpet surfing. It must have been a 1 in 100 shot to be able to pass through one of the squares just right. Or maybe he jumped with enough force to lift the eggcrate cover, and just wasn't lucky enough to have been deflected back down into the tank.