WalletHub also includes some comparisons of the "Best vs. Worst".
Scottsdale, Arizona has the highest share of the population ages 65 and older, at 23.4%, which is 3.2 times higher than Fontana, California at 7.3%.
Brownsville, Texas has the lowest adjusted cost-of-living index for retirees, 75.78, which is 2.6 times lower than San Francisco who has the highest at 195.86.
St. Louis has the most home health care facilities per 100,000 residents, at 57.18, which is 29.9 times more than Fontana, California with the fewest at 1.91.