Age determines a lot about your position in society—what activities you can do, what benefits you can access, and what rights and responsibilities you have. While it seems appropriate to treat people at different stages of life differently, we also consider certain kinds of unequal treatment unjust. So when should we treat people of different ages differently? And when does it become ageism or age discrimination? When does a disadvantage for an age group turn into injustice against a generation? Josh and Ray act their age with Juliana Bidadanure from Stanford University, author of Justice Across Ages: Treating Young and Old as Equals.