If you're at least fifteen years old and you've finished the second year of secondary school, or if you're at least sixteen years old. From that time on you can work as a student worker.
As a student worker you'll pay the minimum in social security, and you won't be taxed. That is, if you don't work more than 475 in one year. Do you want to work more? You can, but you'll start to pay more taxes, and it's possible that your parents lose child support.