Approximately 4% of teachers who taught at least one physics course said that they planned to retire at the end of the academic year. In this report, we examine sources of “new” physics teachers. It turns out that over half of the teachers teaching physics for the first time have prior high school teaching experience in another subject. We also look at the aging of the physics teacher corps. The latest data in this report is from our 2008-09 Nationwide Survey of High School Physics Teachers.