Although your agent is likely to guide you when booking, you should check if your cruise line has any restrictions in types of passengers they will carry. For example, some lines do not allow:
Unwed or unrelated couples under 18 to be booked in the same stateroom.
Children under six months of age to travel and may restrict the number of those under three years of age.
Children under eighteen to travel without being accompanied by an adult over the age of twenty-one.
An adult who is not a parent of a child under 18 to travel with them without a "Parental Consent Guardianship Form" signed by a parent or legal guardian and received a month or more before sailing.
Guests under eighteen to share a cabin without an adult.
Disabled or special needs passengers to travel without someone to assist them in port and on board. The Captain can also refuse to let them disembark in any port or when tendering if he or she feels it is too risky.
They also usually have the right to request a certificate from a medical professional about your ability to take the cruise.
Make sure if you have any unusual factors that you are 100% sure the line will let you cruise - and the way you want to