Rob Lowe was just 18 years old when Francis Ford Coppola cast him in the 1983 movie The Outsiders, and he quickly became a fixture of 1980’s Hollywood. In this week’s “Sunday Sitdown,” Willie Geist gets together with Lowe to talk about the pitfalls that came with that early success and how it propelled a run of nearly 40 years on screen, including in his latest show 9-1-1: Lone Star.