That wasn't my point at all. I think 5 year olds understand those. My point was that if 15 year olds are clever enough to understand the ramifications and legalese of the more serious acts, then we should drop the age of being tried as an adult (to 15 rather than 17 or whatever it is). But I don't think it'd be good to stick them into adult prisons, in that case. Age of majority would be better and keep the adult court idea as is.
Actually, I would support droppng the age at 15. I think most 15 year olds understand quite well what these crimes entail, their social ramifications, and why they're wrong. At 15, they're old enough to know. They're not as stupid as we think.
Tax laws. That's a whole different ballgame because it is so complicated even some accountants don't savvy it. In that case, I think a flat tax would solve a lot of problems.
I'm not sure what other laws you'd be referring to.
Tax laws are the ones that come most to mind, since they seem to be the ones most likely to affect each citizen, though there may be others. Perhaps a flat tax without exceptions for A, B, C, etc. etc. etc. Just have a few basic categories that can fit on one bloody page, the meaning of which is obvious without having to read a book, and which is effective. Bingo.