“seems incongruous, being a “retirement” area”
Well, older people have sex too, and since they don’t have to worry about getting pregnant, I imagine many of them skip all precautions that younger folks might take...
https://www.topretirements.com/blog/health-issues/fact-or-myth-the-villages-is-the-std-capital-of-the-world.html/
https://www.villages-news.com/2019/05/04/villages-101-whats-the-truth-behind-urban-legend-of-stds-in-the-villages/