Androgenetic Alopecia: This condition is common in older adults and can be exacerbated by hormonal changes, particularly the decrease in estrogen levels post-menopause. It leads to thinning of hair, especially on the scalp.

Telogen Effluvium: A condition that can be triggered by stress, medication changes, or significant medical events, leading to a temporary increase in hair shedding. Given the age, it could be related to various health stressors.
Nutritional Deficiencies: Deficiencies in vitamins like Biotin, Vitamin B12, or minerals such as Iron and Zinc can lead to hair loss. Elderly individuals may be at higher risk due to dietary restrictions, malabsorption, or chronic diseases.
Hypothyroidism: Although more common in women, hypothyroidism can occur at any age and may lead to hair loss among other symptoms. The risk increases with age, making it a consideration in this demographic.
Medication Side Effects: Many medications, including those for hypertension, depression, and cholesterol, can cause hair loss as a side effect. Given the likelihood of polypharmacy in elderly patients, this is a plausible cause.

Hyperthyroidism: Though less common than hypothyroidism, hyperthyroidism can also cause hair loss and is critical to diagnose due to its potential to lead to more severe health issues if left untreated.
Alopecia Areata: An autoimmune condition that can cause patchy hair loss. While not typically life-threatening, it can significantly affect quality of life and may indicate other autoimmune issues.
Systemic Lupus Erythematosus (SLE): A chronic autoimmune disease that can cause hair loss among a myriad of other symptoms. Early diagnosis is crucial for managing the disease and preventing organ damage.
Cancer and its Treatment: Certain cancers (like lymphoma) and their treatments (chemotherapy, radiation) can lead to significant hair loss. Given the age, the risk of cancer is higher, making this a critical consideration.

Trichotillomania: A psychological disorder characterized by an irresistible urge to pull out one's hair, leading to noticeable hair loss. It's less common in the elderly but should be considered, especially if other explanations are ruled out.
Tinea Capitis (Ringworm of the Scalp): A fungal infection that can cause hair loss, usually accompanied by other symptoms like redness, itching, and circular patches on the scalp. It's more common in children but can occur in adults, especially those immunocompromised.
Frontal Fibrosing Alopecia: A condition characterized by hair loss and scarring on the scalp, typically affecting post-menopausal women. It's a rare condition but should be considered in the differential diagnosis due to the patient's demographic.