I'm a '60 child, which means I was lucky enough to be able to ride a 250 two stroke in the UK on a provisional license when I was 17.
But we had an understanding. It wasn't the law, it was the accepted progression through the layers of motorcycle performance that we adhered to. Started out with a 50cc moped, then onto a 125 or maybe a 175. This was more to do with affordability - the 250's were out of reach financially for many of us. But you learned about road craft and getting the most out of your limited power. Then it was 250's and the test. Then people did make big jumps - sometimes straight onto a 750, (there were not a lot of 1000 about then). But there were many of us on 400's and 550's for years and years before we made it to the big power.
But my point is that there was a progression over years that imparted a lot about riding on the road, survival, understanding the relationship you have with your bike, the mechanics skills etc, etc.
This is a bit lacking now in my opinion.
We live in a culture of, "I want it now", and there is the ability to buy your way into an experience without really having earned the right to be there.
So, I agree with Ronin, great to see new bikers emerging - who ever they are - that enjoy this world. But I also think they need to adopt an attitude of respect for the time it will take them to accumulate the necessary skills to really deserve the title of BIKER.