Today, eight of the world's most populous countries, or about 4 billion people, are led by politicians 70 years of age, or older. "Wall Street Journal" reporter Jon Emont joins "Doorstep" co-hosts Nick Gvosdev and Tatiana Serafin to discuss the systems and structures that keep aging leaders in power in both autocracies and democracies. What do we lose when generational change is stifled? Can the world effectively address 21st century crises from pandemics, to melting ice caps, to technological advances with 20th century frameworks? Are we reaching a tipping point? For more, please go to: carnegiecouncil.co/doorstep-emont