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The decision-making capacity of older people with cognitive disorders is one of the most important societal and ethical questions in the field of aging. The question is particularly thorny when it comes to addressing sexual consent capacity among this group. Indeed, research shows that institutionalized older people (with or without dementia) maintain sexual interests and needs similar to those of older people living at home. Nevertheless, cognitively or physically vulnerable older people also constitute a group at risk of sexual assault and/or victimization, especially when it comes to people with severe dementia. This article examines the place of the psychologist and their approach to assessing the capacity of sexual consent in older adults with cognitive vulnerability. Following the recommendations of the American Bar Association/American Psychological Association on the assessment of capacity in older adults with diminished capacity, we suggest some methods for assessing the psychological and neuropsychological functions implicated in sexual consent.