This is a circular argument. Okay so what do you call people who start using the internet for the first time now, late late late adopters? Come on you guys are just being ridiculous and spiteful.
I think there needs to be at least some differentiating between people who started using bitcoin back before the average person had even heard of bitcoin. A few years ago if you asked 100 random people what bitcoin was, most would have told you they had no idea whatsoever. Now just about everyone I talk to has at least heard of it and many know a few basic things about it.
I cannot answer the question because it's not even worded correctly. Be specific. What period of time are you indicating for the ones that "started using the internet"?
They would be considered early adopters, I suppose.