Here's the quote you referenced:
"It just sounds like people are scared. It just sounds like people are afraid. And the people who are afraid in general — with due respect, and I am now one of them — are older. Climate change deniers, by way of example, are older. It’s generational. So we’re just going to have to wait for those people to “age out,” as they say. “Age out” is a euphemism for “die.” But it’ll happen, I guarantee you — that’ll happen." -Bill Nye