According to the latest edition of the Global Cruise Ship Index by Cruise Industry News, the current fleet of the global market includes over 80 ships that are 30 years old or older.

The number represents approximately 17 percent of all the cruise ships currently sailing, according to CIN data.

Most of the vessels that are over 30 years old are small and cater to specific niches, including several expedition vessels and some U.S.-flagged ships.

The Sea Cloud, which entered service in 1931 as a private yacht, is the oldest cruise ship still in operation.

Extensively refurbished over the years, the 64-guest tall vessel currently sails for Sea Cloud Cruises in the Caribbean and the Mediterranean.

Operating summer programs in Svalbard for Hurtigruten, the Nordstjernen is the second oldest vessel in service after being built in 1956.

Coming next are two ships that first entered service in 1963: the Callisto and the Galapagos Legend. While the first is currently offering coastal cruising for Variety Cruises in the Eastern Mediterranean, the latter offers expeditions in the Galapagos Islands for Klein Tours.

Ranking fifth on the list of oldest cruise ships in the world is Hebridean Princess from Hebridean Island Cruises, which entered service in 1964.

The Global Cruise Ship Index by Cruise Industry News shows that only 17 ships with  capacity for over 500 guests have made it to three decades.

The number includes vessels like Selectum Blu’s Blue Sapphire, Phoenix Reisen’s Artania and Fred. Olsen Cruise Lines’ Balmoral.

With the exception of American Cruise Lines, a significant portion of the fleet of U.S.-flagged coastal vessels were also built before 1994.

Brands like Alaskan Dream Cruises and UnCruise Adventures operate ships with an average age of approximately 40 years.

The expedition fleet also includes several older vessels, including Antarpply’s Ushuaia, which was built in 1970, G Adventures’ Expedition, which was built in 1972, and Oceanwide’s Plancius, which entered service in 1979.