According to RCLCO, sales were 2,294 in 2015 and 1,966 in 2016. ->
http://www.rclco.com/pub/doc/RCLCO-S...NAL-V2-web.pdf
And,
mid-year 2017 sales for the Villages were 983 ->
RCLCO Advisory: Top-Selling Master-Planned Communities: Mid-Year Update 2017
With sales averaging around 2,200 per year, it would take about 7 years to add 30,000 to The Villages population. I believe this is a reasonable estimation.