RER Ticket Expiration and Photo Question

First I apologize for asking this if it has been answered but I can%26#39;t seem to find an exact answer.

If we purchase our RER tickets at CDG several hours before we plan on using them are they going to expire? Our flight arrives early in the morning and we will purchase our RER tickets then before going to our airport hotel. After lunch we plan on going in to Paris.

Also, do the tickets require a photo on them?

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I assume that you mean one-way CDG-Paris tickets. These, like all Paris public transport tickets, never expire. And they don%26#39;t require photos.

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I purchased my Paris-CDG ticket the day before, as I happened to be in the statin and figured I may as well do it while I didn%26#39;t have luggage with me. So don%26#39;t worry about having lunch.

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Since you%26#39;ll obviously be returning to your hotel at the airport get 2 tickets each and there%26#39;s one less thing to do on your way back from Paris to the hotel...