Journalist Peter Bowes interviewed USC Leonard Davis School Distinguished Scholar in Residence Paul Irving for his Live Long and Master Aging (LLAMA) Podcast. In the interview, Irving explains why he considers aging, along with climate change, to be the “great challenge of the 21st century”. He also discusses the Milken Institute’s upcoming global conference, ‘Building Meaningful Lives,’ taking place in Los Angeles from April 30-May 3, 2017.