How long a 70-year-old man with cerebral atrophy can live cannot be generalized, but needs to be analyzed in the context of individual circumstances. Brain atrophy is divided into physiological brain atrophy and pathological brain atrophy. Physiological brain atrophy refers to the natural aging that occurs with age. For elderly people over 60 years old, there is often physiological brain atrophy, which is a normal manifestation of human aging and does not require drug intervention and does not affect life expectancy. In the case of pathological brain atrophy, it is often associated with certain brain degenerative diseases, such as hippocampal atrophy and frontotemporal lobe atrophy, which may manifest as memory impairment and dementia, etc. The prognosis for such patients is poorer and their life expectancy is shorter. Pathological brain atrophy is difficult to treat and is usually treated only with symptomatic medications. For patients with underlying diseases such as hypertension, diabetes mellitus and hyperlipidemia, active treatment is recommended to control blood pressure, blood sugar and blood lipids to the ideal state to prevent serious complications.