In a context of ageing human population, the question of the elderly people's sexuality, a recent phenomenon, remains without precise and obvious answer. Still, the sexuality of the older person must be viewed as the continuation of the adult's sexuality. However, it is partially or completely, depending on gender, dissociated from the concept of reproduction. Partly for this functional reason, the society estimates that the elderly person cannot feel sexual desire, are not physically attractive, therefore not desirable. Even if they felt sexual need, they would be physiologically unable. Sexuality is an integral part of the quality of life, well-being, and undoubtedly of the person's health whatever their age. It is thus important to deal with this matter from a physiological and biological point of view. Sexuality and deteriorations related to the process of ageing have to be taken into consideration. These deteriorations are not automatically linked to the increase in longevity. It is in the responsibility of health workers, professionally in charge of the elderly people, to help them better understand their desires which lies in a framework of normality. A greater knowledge of their sexuality will fight the current repression of the sexuality of the elder ones.