Originally Posted by
ronin98syu
The price for the kids is €6.40 (€9.25 for adults). In case you decide to take RER B to Paris and then switch to métro, be sure to keep all your tickets because you will need them again to get to métro.
Cheers,
Good advice. Cheap rates for kids are up to 9 years old. After that, I think is full fare.