Basically, we say that prevention starts at birth. The risk factors, and the protective factors that address those, really have no lower age. Usually, we see these programs and interventions being implemented for kids from around the age of eight until 12 or 13.
As my colleague Dr. Caudarella talked about, it's all about improving the social environment of these kids, increasing social capital among parental groups, providing them with meaningful and organized leisure time activities, and so on and so forth. It's about the environment and changing the environment for the younger generation, so they will behave differently—reducing the demand for drugs and the need for treatment.