"Sumter County is a county located in the central portion of the U.S. state of Florida. As of the 2020 census, the population is 129,752. It has the oldest median age (68.3 years) of any US county[2] and the highest percentage of residents aged 65 and older—at 55.6% in 2014–2018 (in 2009–2013)."
From:
Sumter County, Florida - Wikipedia
Add the population of the oldest parts of The Villages located in Lake and Marion counties and the average population is north of 70, likely in the 72-74 range.