Safety standards for blinds have changed over the years. If you're worried about how safe your old blinds are around your kids, then you can retrofit devices like breakaway tassels to their cords.
How do these tassels work, and how do they make cords safer?
How Do Breakaway Tassels Work?
Traditional blind cords work on a looped system. You pull the cord on one side of the loop to control one side of the blind; the other cord controls the other side.