Yeah I see no problem with this....
If the "authorities" are worried that children watch too much porn and these kids then try to porn-themselves-out for pleasure, causing issues since they don't understand that most porn is fake, then for sure forcing people to verify their age when accessing some porn websites will make these kids think twice before accessing any of the millions of worldwide porn websites....
How about you make the life of kids, and people overall, more relaxing? How about you don't force the kids to go to school and parents to go to work, just to survive? Maybe if people were to be more "free" and have time to learn about the world, to have fun, to establish relationships and not worry about wtf they are going to eat tomorrow, maybe we will have saner individuals, ha?!
When the human being is busy 8 hours a day, or more, 5 days a week, or more, with mandatory tasks (school/job), in a society based on trade (consumption), then the easiest and most familiar way to get some "fun" are shallow, fast things. Fast food, fast fashion, fastly-made and dumbed-down media, fast sexual pleasure (watch some porn), and so forth. No time for anything meaningful.