Tyrolean Airways, Austria
app. 600 pilots
no company retirement requirements, but Austria will not renew commercial/ATP licenses past 65 (as all JAR countries).
Pilots usually retire when eligible for state pension with that age slowly increasing to 65.
Currently almost no pilots working past 60 because there aren't any in that age group but I'd expect many to stay past 60 as leaving earlier would mean big cuts to state pension payments.
It will be interesting if the new age 65 "barrier" will be eventually challenged as age discrimination. It is as arbitrary as the age 60 rule was.