2. The time of year you travel - Your 5 day cruise cost will be somewhat less if you travel during certain seasons, such as spring and fall and will always cost more during the summer and around any holiday.
3. The type of cabin you choose - An inside cabin will cost less than an ocean view or balcony cabin, and much less than a suite. Additionally, an inside cabin for 2 with a pair of bunk beds, will cost more than any other inside cabin.
4. The number of people in your family - Your 5 day cruise will cost more if there are 4 members in your family sharing 2 cabins than if all 4 members share the same cabin.
Yes, I understand that age matters. If the members of your family are of a certain age, it may be tough to have everyone in one cabin.
However, aim to keep family members in one cabin to minimize your 5 day cruise cost.