Yeah I have heard that if you stay in Florida for 6 months out of the year you can do that? If so, that would be the plan after retirement. Considering I am only 40 and my wife 38, I don't think we have to worry about that too much right now lol. And we damn sure aren't ultra wealthy! 
Agreed on your ages verses when you may retire.
I think besides health care expense and access to good doctors and hospitals, water and it's ever increasing cost and energy as a whole are going to be huge considerations on where you live going forward.
Overall quality of life goes without saying..
FWIW: You can get a good peek at Jacksonville/Ponte Vedra Beach if you are into golf and watch the upcoming TPC at Sawgrass tournament.