My 20yo daughter skied with me a day in Snowmass a couple weeks ago; a second day in Aspen wasn't working out with her schedule, so on her way back to Denver she stopped and skied alone at Copper. I don't think she had ever done that before, and I was really proud of her. (She just flew to Europe alone -- meeting people there, but flying alone -- a few weeks before that; I think she is growing up!)