From a pax point of view, I find it very sad that American airlines tend to put their oldest FA's on long-haul. Apparently these airlines do not understand that FA's are the faces of the company in the view of most pax. Ask a psychologist: You would learn that people will associate the age and looks of the FA's with the age and safety of the aircraft, and they will also associate the FA's age with the level of modernity of the whole carrrier. This is extremely bad advertising.
I am not saying that I want to see G-strings and nice breast clefts, but being served by grannies does not really make it attractive to choose an American carrier.
I flew FRA-DFW on American last Sunday, and the FA's were at least 50+. Very disturbing, in my mind.