Like everyone else, I'd say let them lead on this one. Both of my kids take French (My DD has been studying it since 6th grade, so 5+ years and my son is on year 3 (as an 8th grader)). My DD spent the summer in Amman with the State Dept last summer to learn Arabic and my son now also takes Japanese and will spend the month of June there this year. I'm just so happy that both kids are passionate about languages. I took 3 years of spanish in high school and don't use it now
Mom to a DD (8/02) and a DS (6/05)