Thank you for your question on ehealthforum.com
The blood supply to various organs is affected with increasing age as a result of changes in blood vessels. Lumen of blood vessels get narrowed due to ageing process called arteriosclerosis, resulting in decreased blood supply to organs. This gets further decreased when one suffers from high blood pressure (hypertension) and increased cholesterol levels in the blood.
Similarly, a blood supply decrease to the brain over a period of time happens and this is visible as infarcts (damaged tissues in any organ due to insufficient blood supply).
Findings on a CT scan of your father appear to be related to his high blood pressure. Patch of bleeding in internal capsule can be a cause for the condition of your father.
It is very important to have good control of high blood pressure and a reduction in cholesterol. Consult his physician with reports. Thank you.