This question posted in May 2010.
However, it is timeless.
It is rumored there are a few more elderly living in Florida than in most other states.
What I have observed in both residential and high occupancy facilities that property values do not decrease.
When marketed as "aging in place" locations, those SFH in the area actually will increase in value BECAUSE the area creates more knowledgeable buyers.
OF worthy note is how these locations endured the 2008-2011 crash.
DISCLAIMER: if the community is prone to abandoned shopping carts, values will go down.