Today's rising costs and longer lifespans are helping to reshape Americans' retirement income needs. Wong Yu Liang/Getty Images

Retirement planning can feel like trying to hit a moving target. Just when you think you've figured out the magic number for a comfortable monthly retirement income, issues like rising costs, market shifts or lifestyle changes shift the goalposts. Adding to the uncertainty right now, though, is the fact that the economic environment is in flux. With issues like inflation trending slightly above the Federal Reserve's long-term target and ongoing healthcare price increases , many retirees are reassessing what they thought was enough.

In general, though, retirees in the U.S. spend an average of around $5,000 per month to cover living expenses, healthcar

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