We cruised for the first time last year and are wanting to take the kids. The kids would be 9 and 18 at the time we are looking at going. The 9 year old I realize will have a lot of activities to participate in but I'm a little worried about the 18 year old. He will be a senior in high school but in reading some of the information the activities and "teen areas" show only until 17 years of age. Would he be kept from attending any events or out of some areas? This is kindof a strange age because he is still in high school but not old enough for the "over 21" activities. Thanks for any info.