Walking the World, based in Grand Junction, Colorado, offers walking and hiking tours mainly for travelers.
Road Scholar, which began as Elderhostel in 1975, was rebranded in 2010, recognizing the values and interests of lifelong learners.
Adventures Abroad offers trips on every continent and describes their clients as "curious, active, and often very well-traveled."
Eldertreks is an adventure travel company designed for people ages 50 and over. Their small-group adventures cover more than 100 countries.
Senior Cycling, based in Asheville, North Carolina, specializes in bicycle tours for active adults ages 50 and up.
Firebird Tours, based in Fort Lauderdale, Florida, with international offices in Australia, Switzerland, and Malta, focuses on clients ages 50 and over.
Overseas Adventure Travel, based in Boston, Massachusetts, specializes in small group travel. Offers a variety of tours to destinations on every continent.
EF Go Ahead Tours, based in Cambridge, Massachusetts, offers small group tours with 14 to 38 guests.
Kensington Tours specializes in creating privately guided trips based on clients' preferences.