There are plenty of people in their eighties and nineties, and centurians out there, that drink tea,etc and don't drink distilled water. My parents and in-laws are all in their eighties, and have only ever used tap water.
I don't believe people are necessarily going to live longer by drinking distilled water. It is more to do with diet in general i would think.
I've decided that i'm not going to bother with distilled, i have enough to think about just improving my diet.