But you don't mean that any female of any age who dresses that way would be calling herself an enby, do you?

The tendency to call one's self "non binary" seems to me to be something exclusive to very young people, and only some young people at that. Of all the people I know, only very few in their 30s, 40s and beyond define themselves according the sex stereotypes they prefer or reject, and hardly anyone feels a need to adopt and flaunt labels that announce to the world which set of sex stereotypes they embrace and which they eschew. This doesn't mean that these people are accepting of sex stereotypes and have never thought of them. On the contrary most people have thought about sex stereotypes growing up and at other junctures in life, and most have decided to reject some, embrace others, put up with some and ignore the bulk.

Most of the older people I know who are into gender labels and "my pronouns" are trans-identified people I've met coz of the new politics around sex and gender. Outside of those small circles, no one I know over age 30 is into gender identity labels - though most of these same people are "gender non-conforming" in myriad ways, particularly according to the the rigid stereotypes many people in their teens and 20s today believe have always been the norm. For example, in my generation (I'm 66), it's quite common for men to be into cooking and baking and various artistic endeavors. But I've had many people now in their early 20s tell me in the past couple of years that cooking and baking, painting and drawing, and playing any musical instrument other than the guitar and drums are things only female people do.