Does global brain atrophy increase risk for intracranial bleed after fall in older adults?

It depends on the location of the hemorrhage. Subdural bleeding/hematoma is much more likely in elderly people with brain atrophy and a fall. Epidural hemorrhage is much more common in young patients. Intracerebral hemorrhage is more related to risk factors such as hypertension in middle age and amyloid angiopathy in older people. Subarachnoid hemorrhage is related to aneurysms, and to a lesser extent, AVMs (which can also cause intracerebral hemorrhages); aneurysms can occur at any age but are most common in middle age.