Going to Paris 29 June. Myself, an adult, and my children ages 16,12,and 9. Will be there until 1 August. Arriving Gare du Nord and leaving via Gare du Nord. What zones should I consider on the Navigo pass and what age uses a Navigo? I am thinking myself and my 16 yo will use the Navigo and the other 2 will use the books of 10 tickets. I plan to pay for separate tickets when we go to Versailles.