You bet it is. Which is why you must make financial decisions today that will allow you to live comfortably well into your 80s. Maybe that means working longer before you retire, working part-time in retirement, or considering waiting longer to collect Social Security (every year you delay between ages 62 and 70 entitles you to a larger benefit).

If you found yourself on the right side of these questions, congrats: you have a strong sense of what it takes to build financial security. But if this information has shown you that you still have work to do, I hope it will motivate you to change your habits and become more informed. With some research and a little resolve, there's nothing on this list you can't master.