Imported from https://meta.trac.wordpress.org/ticket/1074
Created by @iandunn:

CampTix allows users to refund their ticket purchases, but PayPal only allows refunds within 60 days of the ticket purchase.

We should add some logic to the PayPal addon to short-circuit the refund process if the ticket was purchased more than 60 days ago, and show the user a friendly error.