I'm curious, other than McCoy in the TNG pilot, where is there another example, in canon, of a human character living that long?
I'm not saying that it's not true, I would think that it would be at that point. But it seems like a widely recognized fact, despite there not being much evidence of that kind of longevity in the shows or movies.
Off hand I recall Dax telling O'Brien that he would die at 140, surrounded by his family.