Indeed, Genni. If anyone knows multiple forms at a young age, its on the basic level only. Aside from form VII, it is not unusual for padawans to be taught the bare bones of the various forms to see which is best for them, though it will often also depend on what sort of instructors are available. It takes many years to truly learn even a single form, decades to master it. One thing that is often forgotten is that many Jedi don't use just one of those seven basic forms, but rather a conglomeration of several forms, a mixture that fits their particular combat style.