Chinese tea in mental health study

A study in the July issue of the American Journal of Clinical Nutrition found that older ethnic Chinese residents of Singapore who drank tea regularly suffered less mental impairment and decline than non-tea drinkers. This article on the study doesn't narrow down the teas too much, but says they were drinking black and oolong teas, including some non-Chinese teas. Interestingly, the tea drinkers were more socially and physically active, less often depressed, and here's the kicker: also drank more alcohol. Since alcohol is a depressant and at least a temporary source of mental impairment, it makes me wonder how sharp these senior tea drinkers would be if they laid off the sauce. Or maybe they drink the tea to fight the hangover.
Seriously, it's another study showing the health benefits of tea. And this time, it's not green tea getting the good press.