He’s 80 and in fairly good health? Then nothing is going to change.
My father is 83. He lives on his own, after his second wife died a couple of years ago. His first wife also died, nearly 30 years ago (that’s gotta be tough, losing two spouses).
He has some mobility problems, but, aside from some trouble with short-term memory, is in pretty good mental health. He reads and understands complex issues, keeps up with the news, and the family. His heart and lungs, according to his doctor, are in pretty good shape for a man his age.
He doesn’t drive (never has - he’s never had a driver’s license in his life).
He has two drinks a night. Big drinks, bigger than I’d be comfortable with. His two drinks would definitely be three for me, maybe four. He never drinks before 5:00. He never drinks anything but those two drinks. No wine, no beer, just the two whiskies. If I’m at his place, I’ll join him for one drink, but mine are quite a bit smaller than his.
It doesn’t have much of anything in the way of noticeable effect on him. Maybe he gets a bit sleepy by the end of the night, that’s all.
Am I going to take that away from him? It doesn’t seem to have done, or be doing, him any harm. It makes him feel better. What’s the point in giving him a hard time about it?
If someone is over 80, and it’s working for him, and he’s not getting incoherent, or unpleasant, or falling down, leave it alone, that’s my advice. Of course, everyone’s situation is different.