Here's the best age to take Social Security, based on the one variable that really matters — USA TODAY

This is why retirement savings goals are frequently in the millions. Those--and they're a majority--who have to pay for every convenience really need that much to replicate a median income lifestyle.

And, depending on when you were born, you can start receiving your full Social Security benefits somewhere between 66 and 67.

The most obvious dates are age 62 (the earliest date you can choose to start collecting Social Security benefits) and age 65 (when you become eligible for Medicare).