An 81-year-old economist spent decades giving Americans retirement advice — but she still made 2 big mistakes in her own planning. Here’s what they are and how to avoid them

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She’s been the director of Boston College’s Center for Retirement Research since she founded it in 1998. Now, as the 81-year-old prepares to retire on Dec. 31 — she turns 82 on Dec. 6 — she shared …