Even with children there are important differences between age groups, of course; you wouldn't use the same materials or approach with eight- and thirteen-year-olds either. But if we take "children" to mean pre-adolescent and "adult" to mean over 16, the differences are very clear. The first difference, of course, is in the materials; you only have to look at a child's textbook on any subject to see that younger learners need much smaller nuggets of information, and it should be colourfully packaged to gain their attention. Children, after all, have seldom chosen to be in the classroom; yes, you can force them to study, but they won't retain much of the lesson unless they enjoy it. Adults are usually learning from choice, and are prepared to discipline themselves to some extent and accept that not all learning is fun. However, adults also benefit from a lively and varied approach, and above a very young age children can benefit from rote learning and other "dry" tasks, so the difference isn't always so great.
