[staisacic]

To add to Neil's points about heritage, I think another factor is that kendo isn't as well known. I've been to several dojos and dojangs to watch, and none of them really had a diverse group. Just about all of them were either Korean or Japanese descent. The people with Japanese/Korean parents knew about kendo/kumdo, so they were sent as little kids. The others who had parents that did not know about kendo/kumdo are more likely to start at a later age. Our dojang always gets these kids who doesn't know anything about kumdo, but they come because their parents knew about it. The parents often have no idea how kumdo really works, but they saw it at their schools and know that it exists.