It is an older group but there are also children on board. I find it more laid back which since I am retired works for me. I do find that the children on HAL seem to be better supervised by their parents and they also sem to have better manners - maybe it is the expectations. I also think that the age of your children could be a factor. We met a young lady who has been traveling on HAL for over 10 years loves it and she in just 21 and would not travel on any other line anymore.
We travel while most kids are in school so I have not noticed many kids and one of our cruises was in Europe during the school year so there were less children there too. All of this being said - I would take my young gkids on HAl with me and I think they would enoy it but if they are high mainainence and expecting climbing walls then you may want to check out some alternatives. Good luck and hpe my opinion gives some insight.