Large blood vessels found in the back of a victim's nose is the major cause of nose bleeding in older men, according to FamilyDoctor.org. The reasons for the large blood vessels are constant usage of aspirin, high blood pressure and bleeding disorders. Nose bleeds normally gets serious when a patient grows older.
The causes of nose bleeding can be divided into systemic, local and unknown causes, according to the American Rhinologic Society. Local causes can include tumors, trauma, inflammatory diseases and mucosal inflammation. Blood disorders, hereditary hemorrhagic telangiectasia and arteriosclerosis are the systemic causes of nose bleeding in older men.
The American Rhinologic Society further believes that local trauma is the major cause of nose bleeding. Other causes include the existence of foreign bodies in the nose, sinus or nasal infections, and the inhalation of dry air for a long period of time. Vascular malformations and septal perforations are also causes of nose bleeding in older men. Septal perforations refer to the existence of holes at the nasal septum.
Inability of the blood to clot is a significant cause of nose bleeding in older men, notes WebMD. The reason for the failure of blood to clot is because of the type of medications a victim uses. The medications that contribute to the condition include constant use of aspirin or warfarin. Diseases of the liver also make it hard for blood to clot, contributing to nose bleeding.