Back in '69 I knew many girls my age and older who rode motorcycles. I was a high school freshman living in the Mojave desert and we rode dirt bikes. Never ever gave a second thought really regarding genders riding bikes. I have some good friends where both husband and wife have their own bikes / quads for the desert and it is a family event. And, a few who have street bikes both touring and custom too. They are older well into their 40's and older. Again, a family thing.