Diverticulitis: This condition is common in older adults and can cause abdominal pain, typically in the lower left quadrant. The patient's age and symptom presentation make this a plausible initial consideration.

Gastroesophageal Reflux Disease (GERD): Abdominal pain can be a symptom of GERD, especially if the pain is located in the upper abdomen and is associated with eating or lying down.
Peptic Ulcer Disease: Ulcers in the stomach or duodenum can cause abdominal pain, often described as burning or gnawing, and can be related to food intake.
Cholecystitis: Inflammation of the gallbladder can cause right upper quadrant abdominal pain, especially after eating fatty foods.
Constipation: Although more common in younger populations, constipation can cause significant abdominal pain in older adults, especially if it leads to fecal impaction.

Appendicitis: Although less common in older adults, appendicitis can present atypically and must be considered due to its potential for severe consequences if missed.
Myocardial Infarction: Abdominal pain can be a presenting symptom of a heart attack, especially in women but also in men, particularly if the pain is epigastric.
Aortic Aneurysm: A ruptured abdominal aortic aneurysm can cause severe, sudden-onset abdominal pain and is a medical emergency.
Mesenteric Ischemia: This condition, which involves insufficient blood flow to the intestines, can cause severe abdominal pain out of proportion to physical findings and is critical to diagnose early.

Pancreatic Cancer: While abdominal pain can be a symptom, it is often nonspecific and accompanied by weight loss and other systemic symptoms.
Inflammatory Bowel Disease (IBD): Conditions like Crohn's disease and ulcerative colitis can cause chronic abdominal pain but are less common in new presentations at this age.
Abdominal Wall Hernias: Although not rare, hernias causing abdominal pain due to incarceration or strangulation are less common and can be a diagnostic challenge.
Sickle Cell Crisis: In patients with sickle cell disease, a crisis can cause abdominal pain due to vaso-occlusive episodes affecting the spleen or other abdominal organs.