Carnival Cruise initiated its new age policy earlier this month, requiring people under 21 to be accompanied by someone at least a few years older when traveling. When booking a cruise this year, attendees must be 21 years old to travel alone,

For some cruise lines, 18 is the minimum age to travel solo, while others require solo travelers to be at least 21 years old, with some exceptions. Ahead of spring break and summer travel, here is what to know about four major cruise lines' age policies.

Cruise season starts in Seattle in just over a month, and if you are planning to take one— make sure you are aware of the new age restrictions.

Carnival Cruise Line has updated its age restrictions for solo travelers on its ships. For any bookings made after Feb. 1, guests who are traveling on their own must be 21 years of age, according to the cruise line’s website.

"It's very important that if you are traveling for spring break and you are between 18 and 21 that you call the cruise line or your travel advisor because you will either need to have an accompanied adult with you or you're going to need to reschedule or cancel,