The phenomenon of elderly sexual offenders is poorly catalogued, and especially complex. In institutions elderly people are often unrecognized victims of sexual abuse but also at great risk for doing abuse towards vulnerable victims like children. The lack of attention to an elder’s basic needs can endanger or impair not only their health or safety but also of other people living close together. In this letter for the first time we describe an episode of sexual abuse realized by an institutionalized patient toward a young visitor. This specific risk factor in Residential Care Home for Elderly may lead to a variety of negative behavioral outcomes, including the perpetration of child sexual offending. As elderly population will increase tremendously in the next years, it is necessary to better understand the motivations and psychological factors relating to elderly sex offenders, to prevent these offenses and to define standards for surveillance of resident potentially perpetrator.