I've heard of cancer clusters, but what about "wellness clusters?"
 Of course, if an unusual number of people get leukemia, etc in a
concentrated area, some alarm should be raised and a point source of
pollution should be tracked down.
 But does anyone bother looking for "wellness clusters" areas where
fewer than expected people have cancer and other serious illnesses and
try to find out why?
 My personal belief is that you can learn from what's going right as
well as what's going wrong...

ive heard of a village in japan where people age much more slowly than
the rest of the world.  one of the news magazine TV shows did a report
on it.  the town is north of tokyo and they credit the health with a
certain vegatable that the villagers eat.  thats all i remember.

Are you looking for national statistics or something more local?

You may be interested in a recently published book by T. Colin
Campbell, The China Study. He examines data concerning common chronic
diseases and concludes that diet and nutrition explain the differences
between high and low incidence countries. He also makes recomendations
for proper diet based upon his findings.

Try all the usual on line sources or your public library for a copy.

Longevity studies are common at university based medical achools. The
U. of Wisconsin-Madison and the U. of Minnesota have been studying
healthy long living Americans for quite a while. Heredity, ethnicity,
life style and personal happiness play a large role. Particularly,
persons born into rural but comfortable areas of Wisconsin and
Minnesota from the 1890's-1910, German and Scandinavian backgrounds
have created family clusters of considerable good health and long life
among siblings. Also, Irish-Americans born into rural areas of
Wisconsin in the same era demonstrate similar traits. Absence of
alcohol in the culture plays a role.