How can someone of his age think that he can "ace" a cognitve test and beat out someone who is far younger than him?

https://www.huffpost.com/entry/donald-trump-challenges-nikki-haley-reaction_n_65af67f6e4b0f55c6e30a223
Donald Trump Challenged Nikki Haley To An 'Aptitude Test' And You Know What Happened

Donald Trump raised eyebrows when he challenged his Republican presidential primary rival Nikki Haley to a mental aptitude test.


Haley has upped her attacks on Trump in recent weeks and on Saturday suggested the former president is “not as sharp” as he “used to be” when he appeared to mix her up with former House Speaker Nancy Pelosi (D-Calif.) during a campaign speech.

Asked by Fox News’ Martha MacCallum about Haley’s assessment, Trump argued he was “a lot sharper than” his former U. S. ambassador to the United Nations.
The four-times-indicted Trump then suggested, “I would do this. I would sit down right now and take an aptitude test and it would be my result against her result and she’s not gonna win, not gonna even come close to winning.”

“In fact, when I heard the word ‘cognitive,’ you know, I’ve taken two of them now,” Trump continued. “I took one with Doc Ronnie, who’s now a fantastic, you know, White House doctor, and a fantastic congressman from Texas. Admiral. The White House doctor. Jackson. Ronny Jackson. And he’s now a great congressman from Texas. I took one then and I took one recently. I think the result was announced and it was, I aced it twice. I aced it.”

How can someone of his age think that he can "ace" a cognitve test and beat out someone who is far younger than him?
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