I'm not sure that seniors are a group waiting to join tournament chess. If they are, and cost is a factor, chess is already cheap - compared to other possible hobbies. And I agree with others that CFC costs are not a significant line item in a tournament player's overall costs.

Nevertheless... A senior discount might encourage current players who are older (and perhaps play much less often than they used to) to keep renewing their CFC memberships (since they would now have a discount or could look forward soon to having one) rather than letting it lapse. I think a decrease in attrition, though, would take a while to compensate for the sudden drop in revenue.

What method of proof of age is being proposed? What proof is required for other senior discounts - transit, etc.?