What Does Diffused Cerebral And Cerebellar Cortical Atrophy Mean?

''there is a prominence of cerebral sulci ,cisterns and cerebeller folia suggestive of diffuse cerebral and cerebeller cortical atrophy. ''
this is the above sentance come in the report of my father's brain MRI report
i am trying to get what does this means?
what does i need to do ahead?
my father's age is 53
n behaviour of him is getting little wierd
can you sir plz tell me what to do ahead?////