The Age of Learning a Second Language and the Fluency

Does the age of learning a second language affects fluency?

In South African schools, learners are required to learn two languages, a first language, and a second additional language. In reference to your own experience, describe whether learning a second language in school (primary and high school) helped your fluency in that language and whether you think the age at which you started learning the second language had any effect on your fluency.