The Secret to a Successful Retirement: Don't Retire

In fact, the average household facing retirement owns less than $100,000 in 401(k) and other liquid investments, according to the study, led by Alicia Munnell, the director of the Center for Retirement Research.

Given that amount of money, "for many people, even perfect investing is unlikely to have a significant effect on their well-being in retirement," the study says.

That $100,000 in savings won't last long as it will provide only $5,000 a year, over a 20-year retirement, not enough to allow for a comfortable retirement even when supplemented by Social Security, said the study, which is based on an analysis of data provided by the Health and Retirement Study, which conducts a national survey of older households annually.

Nevertheless, many Boomers are retiring and filing for Social Security benefits at age 62, the first year they're eligible. Some do it for health reasons as they can no longer work, others because they're among the long-term unemployed and need the money now, and a lucky few because they can afford to.

The true retirement age, when an individual is entitled to 100% of Social Security benefits, is age 66 for those born between 1943 and 1954.

The future is bleaker for those taking early benefits, the study says, as it's expected that 74% of the households that choose the earliest filing date of 62 will fall short of the money they need to live comfortably.

But delaying retirement until age 66, instead of 62, increases Social Security benefits by at least one third and if one waits until age 67, the odds that you won't have enough replacement income to live on comfortably declines markedly, to 47%.

It's estimated that a household will need retirement replacement income of 75% of pre-retirement income to live comfortably.

As for a reverse mortgage, "the typical U.S. household approaching retirement has nearly $140,000 in home equity, making it the largest asset outside of Social Security," said the study.

Reverse mortgages allow those age 62 or older to tap their home equity while remaining in their home by taking a loan on that equity over the period they expect to live there with the understanding that the loan is repaid when the retiree moves to another living arrangement or dies.

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