The company 'Jeunesse & Co' offers individual support and guidance for young people and their families in various areas of life. The core activity includes support and guidance in the following areas: education, therapy, parenting support, medical care, administrative support, and professional support. The company also provides specific services such as support with administrative tasks, assistance in finding a training place or a job, help with creating application documents, and support in preparing for independence. Overall, the core activity of the company can be described as 'individual support and guidance for young people and their families in various areas of life'.