Just noticed in one of my bike club magazines that the authorities in Paris are gradually phasing old vehicles from the capital. From July 2016 cars registered before 1997 and 2 wheelers before 2000 prevented from entering the city. Between 2017 and 2020 the ban will become total for some vehicles. There is as yet no news on exemptions for accredited classics.
Perhaps some of our French colleagues will have more detailed info on this.