The likelihood that their lack of dementia is due to the consumption of two beverages is close to zero. Lets see what they don't have? Water fluoridation? How many vaccines to they jab into people? How's their Vitamin D levels (probably pretty good)? What are their overall diets like? Many more variables that have nothing to do with drinking tea or coffee. That they are highlighting tea and coffee really points to a sleight of hand, they are telling you to look in one place, so that you don't look in another.