I have realized, at age 66, that "knowledge" about the effects of different consumables (alcohol, caffeine, you-name-it) changes periodically.
That's for sure. About 20 or 25 years ago, so the details are fuzzy, I watched a TV item featuring an elderly black lady who was then the oldest person in the U.S. It seems to me she was something over 110 years old. Her mind was clear as a bell, she had a great sense of humour, and she remained standing for the interview.
The interviewer asked what she attributed her longevity to, and she replied "These", holding up a cup of coffee in one hand and a cigarette in the other.
So I figure if I add something to my consumables, like tea, maybe I improve the longevity odds and get a "quality of life boost" while I'm at it.
ryck