France requires the pilots-in command of international air transport services to comply with the age limits set in Annex 1 (Personnel Licensing) to the Chicago Convention. As the age limits for co-pilots in Annex 1 are recommend practice rather than a standard France will allow co-pilots over 60 to operate in their airspace.
Annex 1 states:
2.1.10 Curtailment of privileges of pilots who have attained their 60th birthday
2.1.10.1 A Contracting State, having issued pilot licences, shall not permit the holders thereof to act as pilot-in-command of an aircraft engaged in scheduled international air services or non-scheduled international air transport operations for remuneration or hire if the licence holders have attained their 60th birthday.
2.1.10.2 Recommendation.— A Contracting State, having issued pilot licences, should not permit the holders thereof to act as co-pilot of an aircraft engaged in scheduled international air services or non-scheduled international air transport operations for remuneration or hire if the licence holders have attained their 60th birthday.