Self portraiture has been around as long as people figured out a way to see their own reflections, I'm sure.

"Selfies" though, fall into the category of things that are off-topic for APUG. I'd see a "selfie" as strictly a digital photograph, ideally produced with a smartphone, for immediate posting on a social media site on the internet.

I have a cousin who made a thing of holding his 35mm Olympus Stylus Epic at arm's length and taking photos of himself with everyone in the family sometime back in the 1980s I think, and I wouldn't call those "selfies," because we didn't have social media then.