I think that there is a different emphasis based on the age you acquire a foreign language. At a younger age (preschool/early elementary), you are also limited by your knowledge/sophistication and language skills in your primary language. There is even a huge difference in the college level Latin texts versus the texts geared toward middle schoolers. At the same time, a different part of your brain handles foreign language learning at a young age (0-8?)that impacts the ability to think fluently in the foreign language and retention of the foreign language.
