......so, has anyone actually seen anything official .......
No age limit in Aus. or NZ. but ... company contracts come into play, and of course the medicals.
I maintained a Class 1 Aviation Med. to age 74, even tho' I wasn't employed, and only because I went to renew it was a problem discovered, and dealt with, unlike the - likely - 100% of drivers hurtling towards me at a closing speed of 220 kph. who don't even know they have a problem, until they wake up dead one morning - or hit me on the road.
I'd rather fly behind a medically monitored pilot, than drive down the road in the face of the vast number of unmonitored drivers.