teenager life expectancy ?

I don't know if there is an official answer to this, but I will try to give you an educated guess. Despite all the new ways that we (I say we because I am a teenager too) can get ourselves into bad situations, I think that once we become adults for a few years that we will probably outgrow the behavior and seek a more stabilized condition. This, plus likely huge advances in medicine before we get older, I would say it's probably somewhere between 80 and 85 years old (it sure would be nice, eh?).