You never know, he could live a LONG time from now...
My wife's grandpa (father's father) is 94 (or maybe 95 by now, I forget when his b-day is) He's been a RAGING alcoholic his whole life. Like, was given "last rites" and a month to live, in... 1965 when his wife died. He's been functional with everybody trying to keep him in line, but when he turned 90 his Dr told the family, "Let him go, he's lived this long already, just keep him out of the car". He's the gallon-0-vodka-a-day kinda drinker, too... and is showing NO signs of slowing down. They had 5 kids, who all live right by him so they all keep an eye on him, but he seems healthier than I do at 1/4 his age...