The Internet has been a free place for 30+ years and I don't see a reason to change that. I grew up with the ability to access all kinds of content on the Internet, in an unrestricted manner, and it is sad to see that decision makers now want to take this away from younger generations.
We must absolutely resist any attempt at profiling Internet users. Age is only the first step. If people give in now, the next step will be other personal information, and it will also be done in the name of "protecting children" or "catching terrorists" as always. The writing is on the wall.