Twitter's new Chief Executive Officer Parag Agrawal is now the youngest CEO in the S&P 500. Agrawal is 37 years old, the same age as Meta CEO Mark Zuckerberg, who held this youngest CEO tag earlier. Twitter didn't disclose Agrawal's birthday due to security reasons, but confirmed that he was born later in 1984 than Zuckerberg's May birthday, Bloomberg reported.