Dental health relies on several factors, not fluoridation alone.  Fluoridation just helps prevent 25% of cavities.  There is dental hygiene, genetics, and the natural level of fluoride in ground water. 

What is the natural level of fluoride in Clallam County's ground water?

Also, populations are very mobile these days.  You also need to look at where those elderly grew up, lived as children, etc.

What do the local dentists recommend regarding fluoridation and what do they say about the dental health of the community?