This case study examines a 75-year-old patient, referred to as Patient A, residing in a residential care facility and diagnosed with dementia. The patient exhibits symptoms of memory loss, cognitive impairment, depression, and schizophrenia, along with tremors and incontinence, compounded by a history of substance abuse. The study delves into the patient's condition, exploring the potential causes, including Lewy body dementia, vitamin deficiencies, and the impact of aging based on the free radicals theory. The analysis covers the physiological processes of aging, such as neuronal loss, vitamin B deficiency, and mental health problems, and their relevance to Patient A's condition. The case study also references various research papers and studies to support the findings and provide a comprehensive overview of the patient's condition and potential care strategies.