Living past 90 — or even 100 — will become more common. Are you ready for it?

One of the biggest challenges in retirement planning is the uncertainty of how long you’ll live. But one thing is clear: You shouldn’t base your plan solely on the average life expectancy. Instead, you should prepare for the possibility of a much longer retirement — potentially lasting 35 years or more.

Much of the traditional advice on retirement planning relies on averages and general rules of thumb, but that advice and those rules may no longer be effective for many people today..