Hypertension: Recurrent nosebleeds in an elderly individual without a history of anticoagulant use or coagulopathy may be related to hypertension. Elevated blood pressure can cause small blood vessels in the nose to become fragile and prone to bleeding.

Dry Air and Nasal Mucosa Irritation: Dry air, especially in heated environments during winter, can dry out the nasal mucosa, making it more susceptible to bleeding. This is a common issue in elderly individuals who may have decreased mucous production and thinner skin.
Nasal Septal Deviation or Other Anatomical Abnormalities: Abnormalities in the nasal passages can lead to turbulent airflow, drying out the mucosa, and increasing the risk of bleeding.
Infections or Allergies: Chronic infections or allergies can cause inflammation and irritation of the nasal mucosa, leading to increased risk of bleeding.

Nasopharyngeal or Sinus Cancer: Although less common, cancers in the nasopharynx or sinuses can cause recurrent nosebleeds. It is crucial to rule out these conditions due to their potential severity and impact on prognosis.
Vascular Malformations or Aneurysms: Rarely, vascular abnormalities such as malformations or aneurysms in the nasal cavity can cause recurrent and potentially severe bleeding.
Granulomatosis with Polyangiitis (GPA): This is a form of vasculitis that can affect the respiratory tract and kidneys, and one of its manifestations can be recurrent nosebleeds.

Hereditary Hemorrhagic Telangiectasia (HHT): A genetic disorder characterized by the formation of abnormal blood vessels, which can lead to recurrent nosebleeds among other symptoms.
Amyloidosis: A condition characterized by the deposition of amyloid proteins in various tissues, which can lead to bleeding due to the weakening of blood vessel walls.
Sarcoidosis: An autoimmune disease that can affect multiple organs, including the nasal mucosa, leading to inflammation and potentially bleeding.