That's all genetics. I know older men with stressful jobs who have been drinking 7-8 drinks a day for the past 40 years and they are happier and have more energy than anyone I've met.
He was not that lucky, and was recently diagnosed with cirrhosis of the liver. Lost tens of pounds after they drained his belly of fluids - we'll have to see what happens next.
So yes, some are lucky, others - not so much. Either way, why risk it? It's like with smokers, you'll find a bunch of 80-90 year olds that have smoked daily since they were 12, but lots of others didn't make it.
As for OP, I have no idea what his drinking pattern is. But the only think that concerns me is the frequency of his drinks, especially if he's somewhat young. This is a pattern that can become hard to break out of, and can get worse with age.