Hi,
I have tried buying a Senior Card from SNCF from the US, and can't. Can you buy them when you get to France or do you have to be a citizen of the European Union. (Even the Rail Europe person wasn't able to answer this question.)
For our experience you have to be an EU citizen. The exception appears to be Spain.
You can walk right into a rail station in France and buy the Carte Senior+. I used my passport as proof of age, so there was no question about my citizenship.
For more information on the Carte Senior+ see my post today in the senior discounts theread on the "Money-savingstregies" forum.
"For our experience you have to be an EU citizen." that would be racial discrimation and illegal in EU. Something which requires or excludes residency of a particular country would be legal. And refusing to post abroad or designing a website that can't cope with foreign addresses is just par for the course!
While the SNCF web site doesn't have pull-down options for non-Europeans buying the Senior+ Card, I'm confident that you can buy it in France, as acraven did. This has been the case for over 20 years. (And Spain is not the only other country with a similar option. Non-Europeans can buy senior-rate discount cards of varying usefulness in Austria, Germany, Great Britain, and Italy, for instance.) Rail Europe doesn't sell these, so their agent would not have any info about them. Note that simply booking early is now usually the best way to get ticket discounts on faster trains. And slower French trains offer some senior discounts without needing the card.
I just checked a Paris-Nice trip for a random day in November. There were some fares available as low as 25€. When I repeated the search with a Carte Senior+, all the fares dropped--the cheapest Prems tickets by just 12%, the more expensive prems or regular tickets by up to 20%. So the card has potential value even for travelers who book far in advance, though they'd need to travel quite a bit to recover the cost.
Thanks to all who replied. I've also gotten some more info from "professionals" and there is no problem buying a Carte Senior+ in France, wherever one comes from. Whether it will save you money over Eurail, regular senior discounts, prem fares etc. or not, you have to calculate -- depends on how tied you are to particular trains, how much in advance you're buying, etc.