Ever heard of a saying: "With age comes wisdom"? What do you think is the best age for the president, anyway?
Trump does that because he thinks he can be good president. And as long as he mental health is in good let him do his job.
Let's not discriminate anyone based on age, shall we?

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Assassination of Trump is highly unlikely but not impossible, still I don't think we have enough of proof to discuss the possibility of such act.
Mere comment that "Trump is a fool for dissing the CIA" is not enough for me. But again, malicious intents of high magnitude are not visible to the naked, public eye.