Millions of retired Americans rely very heavily on Social Security to cover their living expenses. Of course, retiring on Social Security alone isn't ideal. But many people do it anyway. And if you think you might end up in the same boat, then it's important to stay aware of Social Security changes -- even if they won't impact you immediately.

Meanwhile, here are three changes you should be aware of.

If you hold down a full-time job for many decades, you generally do not have to worry about qualifying for Social Security in retirement (provided you're reporting and paying taxes on all of your income). But part-time workers need to be aware that it's getting harder to earn Social Security credits.

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Source Fool.com