That is a pretty broad brush you are painting these young people with. I know quite a few young guys and gals that are passionate about snowmobiling and do volunteer their time when they can. As an older guy myself I have been involved with this sport for too many years, it seems that we do not welcome the younger generation into our clubs in a way that they want to help out and also have fun.
I have 3 daughters, they all look forward to the first weekend of December where they can invite their friends to help volunteer with trail set up. We have Hot chili in the shop afterwards with a warm fire, it's all about the experience. If you make it enjoyable, welcoming and fun, the "young gals(and gals)" will return.