HermanHiddema wrote:But all the evidence clearly suggests that children simply learn faster...
You raise a valid point, though something that is overlooked often is the fact the children are in a situation where their learning is encouraged and, in fact, is pretty much all they do. They have to go to school, they have to study, they have to learn a trade, etc. Being young is all about learning. They have the environment, the social support, the financial freedom, access to the institutions, friends who also learn and study and, above all, time.
How many adults are in a situation where they don't have to succumb to routine? Jobs become monotonous after a few years, it's required to spend eight or more hours a day (and most of one's daily energy) to dedicate to earning money doing the same thing over and over for rent, food, etc.), then time for shopping, cleaning, "social duties" with family, etc. You may end up with 2-3 hours of study time a day, if that, and then it's usually at the end of the day when you're worn. Most adults also aren't in the "study mode". They usually "replay" what they learned a long time ago. If learning is like most abilities, then it becomes easier the more regularly you do it, the more you practice it.
That said, I don't doubt that children pick up knowledge and "skills" naturally. I am not quite as sure whether the difference to the speed of learning as an adult is really as significant, though. Adults are more burdened, by expectations, pressure to succeed, convictions (that they learn more slowly and that they may be past their learning prime -- just believing this might easily lead to a mental block), jobs, other time drains, and so on.
At the end of the day, though, I have to ask (myself, and maybe you): Does it really matter?