In most schools I know kids begin studying foreign language on their first or fifth year at school, depending on the school specialisation.
In our city only three languages are taught at schools: English (predominant), French and German.

Similary, if two foreign languages are taught, kids study their first one from the first grade (6-7 y/o), and the second one from the fifth grade (11-12 y/o).

Language courses are compulsory, of course, as almost all school courses, and parents usually choose school for their kid keeping in mind the language they want the kid to know.