We (61 and 74) will be in Paris for six days in early November. My husband likes to be spontaneous and not be locked into timed entry tickets. We aren't planning on going to the Louvre, the Catacombs or Versailles as I have been to these before and his interest level in anything crowded is pretty low. We are planning to look at the Eiffel Tower and Arc de Triomphe from ground level rather than buying entry tickets.
I am just trying to work out how busy Paris will be and whether we would need to book timed tickets for Musee D'Orsay, Pompidou Centre, Musee de Cluny and Chateau de Fontainebleau. We would love to be able to just meander around Paris and turn up to museums when the mood suits us.