I think besides singing and dancing they should also be made to demonstrate their skills in a jelly-wrestling pit. A form of "milling".
And why not??? This way they can show just how determined they are to get the job. A lot will fail the test and this saves the airline in the long run. And no one gets hurt because it's only jelly.
This would solve the "age" issue because the boilers would throw out a hip or drop their false teeth into the tub and lose the round.
At the same time the pilots can be standing around checking out their assets in the area of what they have no control over.. IE they were born with (or without) it. This is also important.