When I was a child, I never learned English until I go to a junior high school. There were kids learning English but not so much those days.
Now people think having knowledge of English is very important. Because of it many kids learn English now. There are many materials to learn English even for babies like music, books, etc. That means now kids can learn English easily at home.
Maybe, within 10 years there will be tons of people who can speak English, so it might be wise to learn a different language other than English now I guess!