A Roth IRA is like a gift from Uncle Sam for young people -- a flexible savings tool with tax-free growth, Kevin McCormally writes. He explains that a 25-year-old who contributes $5,000 a year can save about $1.4 million tax-free by retirement. Even before retirement, account owners can use some of the funds to buy a house, pay for a child's education or help make ends meet in an emergency.

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