My father always used to say that his goal was to stop working once his 70th birthday arrived. His logic was that at that point, he'd have put in his time in the workforce and would be entitled to a more relaxed lifestyle.

But my dad turned 70 late last year. And as of now, he's still holding down a full-time job.

Some of his friends who are retired have encouraged him to join their ranks. But I keep telling Dad that it's in his best interest to keep working as long as possible. Here's why.

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Source Fool.com