http://www.youtube.com/watch?v=T-TA57L0kuc (not really safe for work - but funny) - I start with this because I suspect you are trolling, however I suppose there is an outside chance you (or someone reading this) actually believes your post..........
Now, on a serious note, there are many things that are considered restricted, some such as cocaine are restricted to everybody - in effect removed from society (yes I know that you can still plenty get coke but there are legal consequences for making, selling and possessing it).
Others, such as cigarettes, alcohol, restricted films/videos, voting, driving cars, having sex, etc. are deemed inappropriate up to a certain age and OK after that with the acceptable age dependent on the restricted content.
So why should the internet be any different? letting 10 year olds drive cars on the road would be absurdly insane and very dangerous to the child and those around them - but we don't ban cars we restrict children from driving. So clearly the way to address legal, age restricted porn on the internet is to ban children from going online - simples as the really irritating meerkat would say.
Or we could be sensible about this and leave the responsibility up to the parents - I imagine you control your children's access to any tobacco and alcohol products you have in the house (with consequences if they steal any) and if you have a physical porn stash you keep it safely locked away - so why should the web be any different?
Or are you trying to make things easier for the really bone-idle lazy parents who 10 years ago would have just sat their child in front of the TV rather than actually parenting - safe in the knowledge that someone else controlled the content so not only did they not have to bother bringing up their own kids but they didn't even have to take any interest in what said kids were doing during the time they couldn't be bothered parenting them - rather than now where they cannot just sit their kiddies in front of a computer all day without having to answer questions like "mummy, why has that man put his hand up that lady's bottom?" or worse?