Not really. I learnt my four fluent languages before 12. One was the mother tongue at home, the second was English, the third was the language of the region I was living in, the fourth was the majority language of my home country. I picked up French at 12 though it's not as fluent as the others (i.e. I don't dream in it yet).

Helped that three of the languages (and later French) were taught in school, I guess.