If it means working longer, affluent investors are prepared to do so to alleviate their concerns about retirement savings and the rising costs of health care.

According to Bank of America Corp.'s Merrill Lynch Affluent Insights Quarterly survey, issues related to retirement and health care rank highest among financial concerns. Among those who identified health care as a top concern (62%), more than half (56%) reported feeling unsure of how rising costs should factor into their retirement planning, up from 40% in January. This may help to explain why the number of survey respondents concerned about whether their assets will last throughout their lifetime rose to 61% from 53% during the last quarter.

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