The subject matter of the book is the characteristic of contemporary Polish seniors as the computer and Internet users. It presents the analyses based on the results of broadly extended research on seniors activity undertaken in the Web, taking into account their age and gender, as well as personality traits and psychological well-being. Furthermore, the results concerning the Internet competency of seniors are presented. Advantages of the publication: 1. The results presented in the book concern unique, particularly interesting, both for the Internet and human development researchers, group of Internet users. These are people who come into contact with the Internet in the late period of their lifes. Each subsequent generation of old people will be one that have started using the Internet in early youth or childhood. 2. It presents a study in which for the first time actual competencies of older people were assessed experimentally, and not only – as heretofore – self-reported competencies. 3. The book includes theoretical and practical conclusions, the use of which should help to prevent digital divide of seniors.