With recent interest in industry, wearable computers with head-mounted displays are about to become mainstream. As it is typical for novel technologies, development is directed towards early adopters. This typically excludes special target groups such as older adults with age related special needs. However, it is necessary to consider their requirements when the technology matures, as they can benefit from wearable computing. In this paper we present an explorative, qualitative study with three older adults that used a wearable computer with a head mounted display during everyday activities. We derive requirements from the usage of existing applications, describe emerging usage patterns, highlight promising applications, and the reaction of the public.