As a financial planner who spent the first part of my career helping people save and invest money, this opportunity cost is the single scariest. It is not just a missed opportunity that you’ll someday kick yourself for, snap your fingers, and say “Aw Shucks!” Rather, it’s an opportunity cost that will determine the day-to-day existence of possibly one third of your entire life. I’m talking about retirement.

Now, a good percentage of you reading this book will say something along the lines of “retirement is so far away that I’m not worried about it” or “I’ll worry about retirement when I get out of debt.” But, the key thing I want to pound into your head is that retirement planning is monumentally less painful the earlier you do it. In fact, if you wait until 15 to 20 years before retirement to start planning, you may not be able to pull it off.

Why is it such a big deal? Well, the biggest problem is that people are living longer and longer, and our employers and Social Security system are giving us less and less. In fact, it is very possible that you might retire at age 65 and live to be close to 100 years old. That means that 35 years, or one third of your life, will be spent without income from a job. If you are hoping Social Security is going to cover even the majority of that, think again.

I don’t mean to scare you, but rather hope to give you some major motivation for moving forward. Just like my wife kept her eyes on that little sailor outfit during delivery, you need to keep your eyes on retirement as you try and decide what to do with each and every penny of your income and expenses.