Objectives: Although dementia typically occurs in older people, it can also emerge in people aged younger than 65 years in the form of young‐onset dementia, the most common type of which is Alzheimer's disease (AD). However, few studies have examined the needs of persons with young‐onset AD (YO‐AD) and their families, and cross‐cultural research on the topic is even scarcer. In response, we investigated the situations, experiences and needs for assistance of carers of persons with YO‐AD in Brazil and Norway.