Easy bruising of the skin at your age is usually due to increased skin fragility as skin thins with age. Mild trauma can cause bruising. It can also happen if one is on blood thinners like ecospirin, etc. Excessive amounts of herbal or green teas, Chinese herbal medicines or supplements too can predispose to easy bruising. You can get a complete blood count with platelet count done along with a basic coagulation profile to rule out any blood abnormalities. Vit C supplements can be taken orally and it may help in improving the condition.