"While the number of people ages 75 and older who move at all is relatively small, a survey of geographic mobility released last month estimated that about 121,000 of them left the South from 2000 to 2005, and 87,000 arrived. In a comparable survey a decade earlier, 57,000 left the South and 92,000 moved there." according to a US Census survey released last week.
Reasons cited: hurricanes, family, better senior services, more walkable communities/less need to drive, according to the
NYTimes article.