Today, in developed societies, life expectancy is noticeably increasing due to improved healthcare systems and medical advances. Along with a longer aging period, falling birth rates, and other concomitant social factors, the age distribution is evidencing a shift towards the demographic expansion of older population stages. Epidemiological studies about this demographic aging distribution of the world population indicate that older adults are experiencing a variety of age-related problems, including Dementia. Dementia is overwhelming and frightening for both loved persons who live with Dementia, and also their caregivers. The number of people living with Dementia in societies is now rising at an unprecedented rate. Neither decisive treatment, nor effective medicines have been introduced to help society cope with such age associated pathologies. However, one promising alternative to this emerging crisis has been the adoption of Assistive Technologies (AT). Therefore, for this study, a systematic literature review is conducted to provide an overview about recent findings in this field of study and also address some available technologies that have potential application for Dementia sufferers. This work makes a report on existing technologies in the field, thus becoming a survey on existing supportive technologies for People with Dementia (PwD). The findings of this work provide an insight into the types and percentages of suggested technologies for each classification that aim to be useful for those researching the field or who want to know state of the art in this presently relevant domain. Concluding points and discussion are presented subsequently.