I got accused of ageism before for saying the same that there should be mandatory retirement for public officials. However, the most convincing argument I heard for letting elders to still run for public office is that their accumulated experience, knowledge and wisdom could still be of great dispense for the public. Noam Chomsky is still doing well despite in his 90's, for example.
But Chomsky did not get it right with his genocide denialism on Cambodia and Yugoslavia. He may have great insights, but his ego seems to have been entrenched on downplaying atrocities of other anti-Western countries simply because they are anti-America. And then there is also the time when Chomsky basically brushed aside his association with Jeffrey Epstein, by telling the interviewer to mind his business. It's not a proof in and of itself, but it's very suspicious.