What does The ventricle and sulci are somewhat prominent for age mean?

The description is consistent with brain atrophy, which can be just asymptomatic aging, but can be associated with dementia, chronic alcohol use, multiple sclerosis, and a variety of degenerative neuronal causes. You might have issues with memory, focus, concentration. This can be caused by repetitive head injuries or a family history of cognitive losses. As we get older the brain gets smaller so these findings described here are not uncommon. If you are 25 years old you have problems, if you are 70 years then this is the result of aging.