If he isn't senile now, that suggests he's always had pablum for brains but older interviews don't really hold that out.
Even if he doesn't meet the diagnostic criteria for a specific form of dementia, the man seems to clearly suffering from obvious mental decline. Further, he shows evidence of sundowning with his regular agitated and confused evening/late-night social media dumps.
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The Party told you to reject the evidence of your eyes and ears. It was their final, most essential command.
If you're not careful, the newspapers will have you hating the people who are being oppressed, and loving the people who are doing the oppressing. —Malcolm X
If you feel useless, just remember the USA took four presidents, thousands of lives, trillions of dollars and 20 years to replace the Taliban with the Taliban.