Say Yes: Mel Brooks at 95:

I’d learned one very simple trick: say yes. Simply say yes. Like Joseph E. Levine, on “The Producers,” said, “The curly-haired guy—he’s funny looking. Fire him.” He wanted me to fire Gene Wilder. And I said, “Yes, he’s gone. I’m firing him.” I never did. But he forgot. After the screening of “Blazing Saddles,” the head of Warner Bros. threw me into the manager’s office, gave me a legal pad and a pencil, and gave me maybe twenty notes. He would have changed “Blazing Saddles” from a daring, funny, crazy picture to a stultified, dull, dusty old Western. He said, “No farting.” I said, “It’s out”… You say yes, and you never do it.

This seems like quite the win as a life hack…