I'm with sorvad on this. I knew someone who retired at 65 and lived to 92, when, according to the stats, he should have died at 67 or so. I also know someone who retired at 57 and is still going strong at 88. To be fair, neither of them worked for the companies that commissioned the study.
To extrapolate from sizematters' observation, never work, never die. That can't be right can it?
STP