If you think adventure travel is just for the younger set, think again: A growing segment of senior travelers are looking to amp up their next trip with some adrenaline and adventure. And increasingly, tour operators are targeting this valuable demographic.

Case in point: Consider the incredible "Your Age is Your Discount" offered by Cayuga Sustainable Hospitality Resorts for six eco-luxe properties in Costa Rica and Nicaragua. Back by popular demand, the promo works like this: The age of the oldest traveler in the room equals the percentage discount off the total hotel room rate.

In other words, bring your 75-year-old grandmother, and you’ll get 75 percent off. And yes, if you bring your 100-year-old great-grandfather, you’ll stay for free.

There are a few details to keep in mind. First of all, you must redeem the deal before November 15, call to book, and provide valid ID for the traveler getting the discount. In addition, one of the properties, the Lapa Rios Ecolodge, has a 50 percent maximum because of the hotel’s all-inclusive discount.

Although you'll have to act fast to book – and travel soon, too – this is a great way to experience some of the swankiest eco-lodges in Central America. On tap for the adventure offerings: horseback riding, hiking, kayaking, river rafting, and ziplining.

See our Costa Rica Travel Guide for more trip-planning information, then use our Travel Search price comparison tool to find the lowest rates on flights, hotels, packages, and more travel deals.