As a senior citizen (in addition to a being PM and 3MM), I intend to avail myself of pre-boarding as much as possible (unless of course I am drinking in the SkyClub and don't feel like getting on the plane until right before the door closes, since DL has eliminated PDBs.
I think DL has to bring back priority boarding for elites and the credit card customers they induced to come on board. They are going to have another public relations nightmare if they don't.