As Minh said, the question wants to know if you are working and have the opportunity to contribute to a retirement plan (if so, that box 13 should be checked).
The reason it is asking is because in some cases, your deductible IRA contributions may be limited if you also have the ability to contribute to a retirement plan at work.
If you are already retired, this is a moot point. In your case, just answer "No".
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