Sanora Babb died on Dec. 31, aged 98. Harry Magdoff died on New Year's Day, at 92. Frank Wilkinson died a day later, at 91.
My line has always been that to get really old it pays to have been a Commie or at least a fellow traveler. In younger years they tended to walk a lot, selling the party paper. They talked a lot and, above all, they never stopped thinking. The quickest way to kill someone is to send them off to quasi-solitary, torn from their comfortable nest and thrown into a nursing home or into managed care, where people talk about them at the tops of their voices, referring to them in the third person. You can see them dying before your eyes, their brains turned to mush. It takes about a year to kill them off, unless a "surprise birthday party" wipes them out even earlier.
Trotskyists tend to be more feverish and stressed out, hence less likely to turn the bend into their 90s. As for Maoists (over here), I don't know. As Chou En Lai answered, when asked what he thought of the French Revolution, Too soon to tell. The ex-Maoists I know are mostly still in their mid-60s.