Diabetic Neuropathy: This is a common condition in older adults, especially if the patient has a history of diabetes. The severe stabbing pain in the feet could be due to nerve damage caused by high blood sugar levels over time.

Peripheral Artery Disease (PAD): This condition involves the narrowing of peripheral arteries, which can cause pain in the feet, especially when walking. The stabbing pain could be a symptom of reduced blood flow to the feet.
Gout: A form of arthritis characterized by sudden, severe attacks of pain, swelling, redness, and tenderness in one or more joints, most often in the big toe. The pain can feel like stabbing.
Peripheral Neuropathy (non-diabetic): Causes can include vitamin deficiencies, alcohol abuse, or exposure to toxins. The symptoms can include stabbing pain in the feet.

Deep Vein Thrombosis (DVT): Although less common, DVT can cause severe pain in the foot or leg and is a medical emergency due to the risk of pulmonary embolism.
Osteomyelitis: An infection of the bone that can cause severe pain and is a serious condition requiring prompt treatment.
Compartment Syndrome: A condition resulting from increased pressure within a muscle compartment, which can cause severe pain and is a medical emergency.

Erythromelalgia: A rare disorder characterized by burning pain, heat, and redness in the hands and feet. It can also cause stabbing pain.
Complex Regional Pain Syndrome (CRPS): A chronic pain condition that most often affects one of the arms, legs, hands, or feet after an injury or trauma. The pain is out of proportion to the severity of the initial injury.
Fabry Disease: A rare genetic disorder that can cause burning or stabbing pain in the hands and feet due to the accumulation of a particular type of fat in the body's cells.