DBC would most likely be 95 years old, or so, if still alive. I too, believe he made it. Some feel he is still alive, and tap Sheridan Peterson as the real DB. These pages are filled with our commentaries on ol' "Petey."
BTW: the alibi for Richard McCoy for Turkey Day, 1971 is not rock-solid by any means. SA Russ Calame and his team have gas receipts for McCoy in Las Vegas for the day before, and also phone company confirmation of a collect call from McCoy in Vegas to his home in Provo for 10 pm on Turkey Day. Again, I highly recommend Calame and Rhodes' book: DB Cooper - The Real McCoy.
Personally, when we discover who DB really is, we're gonna say, "Who's Dat?"