And some don't.
I have a niece that from about 12 or 13 would take selfies by herself or with friends and without exception every one of them they were making weird faces.
Fortunately upon graduating from High School she joined the Air Force and now five years later she is a Staff Sgt.
Some do grow out of “selfies”
I think taking selfies is a perfectly innocent, harmless way for kids to have fun—so long as they don’t put themselves in harms way to get a shot. For adults, it’s just silly.
And some don't.