Doesn't necessarily matter if he did or didn't. My father didn't smoke or drink, and yet still had a similar thing happen. (Of course, he was stressed beyond belief...and he didn't die.)
When older people have heart attcks they have a better chance of surviving, because the heart tends to grow secondary arteries, which allows them to survive. The same heart attack in a younger person is usually fatal, on account of those arteries not having been formed. ...at least that's the explanation I've been hearing for years...