Unless the transitional measures provided for by the accession treaty of the country of which they are nationals apply, the third-country nationals mentioned in articles L. 200-4 or L. 200-5 aged over eighteen or, if they wish to work, aged at least sixteen, must be in possession of a residence permit. This permit, the period of validity of which corresponds to the intended period of residence of the European Union citizen whom they are accompanying or joining, up to a maximum of five years, bears the words “Carte de séjour de membre de la famille d’un citoyen de l’Union” (residence permit for a member of the family of a Union citizen) and entitles its holder to engage in professional activity.