Not really, no.
My maternal grandfather lived until he was 97. His GP had previously told him the only way he wouldn't see 100 was if he got cancer or something, and that's exactly what happened, and what he died from. He was still very physically active (walked a few miles a day) and in full retention of his mental faculties up until his diagnosis. The daily walking stopped pretty soon after diagnosis, and he didn't start slipping mentally, until about the last 3 months of his life.
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