While people can often estimate how much they might need for 10 or 15 years of retirement, that calculation becomes more difficult for retirement that could last 20 years or more. Gary Waters/Ikon Images/Getty Images hide caption

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That Nest Egg Needs To Last As Long As You Do. So How Do You Start?

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Several Silicon Valley entrepreneurs are developing services that manage consumers' investment portfolios with algorithms rather than people. iStockphoto hide caption

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Can Robots Manage Your Money Better Than You? Startups Say Yes

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