Most of the permanent collections of national museums are free for young people under 18 and for U-26 citizens of the EU. This free charge applies every day, without exception. On the other hand, temporary exhibitions usually pay off.
The Louvre Museum (1st) is free for all on Saturdays from 6pm until closing at 9.45pm.
We have a little crush for a museum a little apart and free: Fragonard Perfume Museum in the Opera district (9th).
FREE MUSEUMS FOR YOUNG PEOPLE
FREE ACCESS TO PERMANENT COLLECTIONS IN PARISIAN MUSEUMS
You will find below the (not exhaustive) list of the main Parisian museums of which permanent collections are free for all and all year long.
FREE ADMISSION TO MUSEUMS ON THE 1ST SUNDAY OF THE MONTH