OP here: Thanks for all the info folks. I used to do my own brakes way back when I was young. But that was in the day of drum brakes, never messed with disc brakes, and don't really want to.
Your input is very helpful since I don't really keep up with these things. Was kind of surprised the fronts were gone, but guess the grooves tell the tale. My 2007 f150 had good brakes at 105,000 when I got rid of it. I'm wondering whatever happened to the little metal tabs that squealed when pads were getting low.
Thanks again