I'm not saying poeple should be let go only because they get older and less attractive. I'm just stating the obvious fact that a large percentage of the value an FA brings to the table is the appearance and demeanor they present when serving customers.
We've had this conversation before; and I am just stating the obvious demand-sided facts of what passengers prefer when flying. FA's serve the passengers, just like a waittres or waiter serves a restaurant customer. As far as the passenger is concerned, that is the only thing they see an FA as, and they make no distinction between a waitress and an FA when it comes to what they prefer.
Now, go to a sampling of restaurants and see if the demographics mathches that of the FA group. The reason it doesn't match, and why it goes against the will of the market demands for this service, is because of the unfortunate affect of unions. It is detrimental to everyone involved; the passengers get much poorer service, and the airline gets strapped with a very unproductive and entitlement minded workforce. Naturally, the FA wins big, as he/she has maintained a job at a rate of pay and lifestyle that he/she could never achieve (before restructuring) in a similarly skilled job in the other services industries.
by the way, how is this sex discrimination?
Also, your analogy to financial skills as you get older is pretty idiotic. It doesn't work that way.