Americans think the ideal age to retire is 61. Unfortunately, according to a recent survey from financial website Bankrate, which polled 10 certified financial planners from different parts of the country, it may be wise to wait longer.

63 is the more realistic age, they say, while nearly one in five respondents say you should wait until you're at least 70. Award-winning financial advisor and former CNBC host Suze Orman agrees.

She points out that Americans are living longer, so your retirement savings need to last longer, too. "You likely have plenty saved up to breeze through 15 years or so of retirement. But if you stop working in your 60s, your retirement stash might need to support you for 30 years, not 15."

A report from the Stanford Center on Longevity comes to a similar conclusion. Researchers analyzed 292 retirement strategies and determined that a key component of retiring successfully is delaying Social Security payments until age 70.

The best way to implement what they call the "spend safely in retirement" strategy is "to work just enough to pay for living expenses until age 70 in order to enable delaying Social Security benefits."

"In essence," the report adds, "age 70 is the new 65. To make this method work, retirees may also need to significantly reduce their living expenses."

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