Mention the fact that you're a senior when you first make your travel reservations. All major airlines and many Scandinavian hotels offer discounts for seniors. Often people over age 67 are entitled to 50% off the price of first- and second-class train tickets. Ask for the discount at the ticket office.
INTRAV (tel. 800/680-2858; www.tourvacationstogo.com) is a high-end tour operator that caters to the mature, discerning traveler, not specifically seniors, with trips around the world that include guided safaris, polar expeditions, private jet adventures, small boat cruises down jungle rivers, and trips to the Norwegian fjords.
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.