best option to answer each of the following questions.

Did you ever wonder why it is so difficult for adults to start to learn English or a foreign language? Every year, millions of grown-ups around the world spend a large amount of money on learning English but not many of them succeed in becoming fluent English speakers. This is because it is not easy to pick up a new language after a certain age. However, small children learn foreign languages without much difficulty. This is because they have a special ability that helps them learn languages fast. This ability weakens when people grow older. Think of the little time children need to learn their native languages. Therefore, if you have the desire to learn English or any other foreign language, you should begin as soon as possible. Remember that the longer you wait, the harder it will become. 

The best title for the passage would be ______.