Some Americans, mostly older women, don't know their SSN because they never used it. Their husbands handled taxes, opened bank accounts, and collected Social S

Some Americans, mostly older women, don't know their SSN because they never used it. Their husbands handled taxes, opened bank accounts, and collected Social Security. If you've ever dealt with medical data, SSN is not a reliably unique identifier. Couples will share a number because each gives the "relevant" number instead of their own.