thats very interesting, I know a lot of elderly people, the one thing I have learnt is that as you age the size of meals and drinks substantially reduces in comparison to a person in their 30s-40s, particularly in the case of people in their 70's and 80's. In fact I dont know of any people of that age who would be able to consume and entire bottle of wine a day, preferring to have a nip of something strong. I have also noticed that older people tend to be more health conscious, eat a much healthier diet and take regular exercise.
I believe in live and let live, if you enjoy a bottle of wine a day, then good for you :)