Catchup,
In all JAR-FCL-states (19 as of now) the upper age limit for pilots (not limited to 'commanders', as this is an operational title, not a licensing one) involved in Commercial Air Transport (i.e. transporting passengers, goods or post for renumeration) is 65 years, on the condition that the other pilot be younger than 60.
Exceptions: France, Italy, Czech Republic, who use respectively 60, 60 and 62 years as max. Italy and Czech Republic state that they only use this limit for their own pilots, while France applies this rule to anyone in French airspace.
Apart from CommAIrTransp, there are no age limits in JAR-FCL, neither for private or commercial pilots. There might be some additional national limitations in some states, though.
Any further limits in union contracts, operators policies, etc, are purely of 'private' nature and uninteresting to licensing regulations.
Cheers, Redbar1