Generally so-called "senior discounts" aren't all that they're cracked up to be. Before accepting one, go on the internet to find out whether you can get a better rate, especially for hotels. And note that

Many reliable agencies and organizations target the 50-plus market. Road Scholar ( arranges worldwide study programs for those age 55 and over.

Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.