Common sense on the age card is needed
Carrier - you make a good point. In Canada, my understanding is, provided there is no regulatory framework to be taken into account of, you can't mention age. ICAO is 65 pretty much now - see my previous post.
Common sense needs to apply to of course - look at the blue rinse grannies still working the cabin on the overseas to London and Paris especially - and the rap we get for their attitude and poor service is incredible (and sometimes deserved).
Flight deck is different - experience counts for all - but the jury is still out if experience over 60 actually means an increased margin of safety or the opposite...