This US map shows something about workers, do you know what it is?

This US map shows something about workers, do you know what it is?

This map of US states shows something about workers in each state.

Do you know what that is?

Please make your guess in an opinion.

Correct answer will be given in a few days (Friday).

Updates
3 mo
Congratulations to those who got this.

The map shows, for each state, the percentage of people over 65 (typical retirement age) who are still working.

Until I saw this, it never occurred to me that 1 in 5 Americans over 65 is still working. I wonder if those who continue to work do it voluntarily, or whether it's necessary to survive and continue their lives.
This US map shows something about workers, do you know what it is?
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