Psychologists at the Washington University in St. Louis have come accross a very interesting association between aging and the personality. this link seems to be a very strong one. It has been understood that the emotional and social back ground of the person is in direct linkage to the speed at which he or she ages. Since the results are one of a kind and it will take a lot of time to understand the full effect of the personality of the person and the way in which he ages, it may also be the other way round.

Neuroticism seems to be directly linked to lower grey matter while aging and conscientiousness is linked to higher levels of grey matter when the brain ages. this shows that a stressful and eventful life may lead to loss of memory and a lot of the related issues of old age. Now the focus is on studying the subtle changes in the personality as a person ages and link it with the changes of a person’s chances of developing illnesses such as Alzheimer’s. Read more .

Here is the original: 
Personality May Influence Brain Shrinkage in Aging