Looks, as they say, are only skin-deep.
Throwing away an employee who does a great job at the ripe old age of 35 is as stupid as hiring someone simply because they're a size 2.  Job performance should determine continuation of employment (and hiring), over 
just a pretty face anyday.  I do firmly believe in height/weight restrictions that affect job performance, for example the ability to walk forward-facing down the aisle, the ability to operate and expeditiously exit through 
any exit on the airplane (window exits included), and the ability to maneuver galley equipment.  If age or size prevents operation of or egress through an exit, then something needs to change.  Either retirement or weight loss.
There was a time in history when women were not allowed to vote, a time when women were expected to only have babies and tend to a home, and I personally am glad we've moved past that as a society 
