High Blood Pressure Affects Brain?

I saw an interesting little snippet in the newspaper the other day which stated that having "high blood pressure can damage the brain." The article went on to say that scientists had discovered that even a small elevation in blood pressure in your thirties or forties can in fact prematurely age your brain. This could have more serious repercussions further on in life. Based on the study findings - a thirty three year old person with high blood pressure was found to have a brain age of a forty year old.