Permanent alimony is not uncommon. In many states, marriage for 20 years almost automatically allows for it.
As the article says, in Florida (and many other states) there are only two criteria for alimony; first, a discrepancy in income, and, second, ability to pay. Whether it becomes permanent or not usually depends on the length of the marriage and whether or not the spouse receiving alimony remarries.
try fl’s 12 years,
even though fl has a boyfriend cohabitation rule, good luck proving it.