He dead.
Back in 2001 he was suffering from type II diabetes and needed dialiss. If a bomb didn't kill him, lack of medical care did.
Honestly, I just don't know what the government knows or doesn't know. If they truly know where he is, they should get him and get it over with. I would like to think they would do that. Also because Obama's popularity is in the tank, if he could capture him I am sure it would improve his dismal popularity numbers . My guess, is that if he is still alive, the government doesn't have a clue as to where he is. But then again, nothing surprises me anymore. He may be living in Brooklyn working as a cab driver.
i think we likely got him in Tora Bora with a thermobaric bomb
but there wouldnt be much left of him but maybe a splotch of DNA on a cave wall
but keeping him alive as a legend seems to fit the purposes of both sides
the US for having the enemy still at large hoping to keep complacency at a minimum, and for Al Qaeda to use him as "surviving everything we threw at him"