Constipation: Given the age of the patient, constipation is a common issue that can cause abdominal pain due to decreased bowel motility and harder stool consistency.

Diverticulitis: Inflammation of the diverticula in the colon, which is more common in older adults and can cause abdominal pain, usually in the lower left quadrant.
Gastroesophageal Reflux Disease (GERD): Stomach acid reflux can cause abdominal pain and is common in older adults due to decreased lower esophageal sphincter tone.
Peptic Ulcer Disease: Stomach or duodenal ulcers can cause abdominal pain and are more common in older adults due to increased use of NSAIDs and Helicobacter pylori infection.
Cholecystitis: Inflammation of the gallbladder, which can cause abdominal pain, especially after eating fatty foods, and is more common in older adults.

Mesenteric Ischemia: Reduced blood flow to the intestines, which can cause severe abdominal pain and is a medical emergency that requires prompt treatment.
Ruptured Abdominal Aortic Aneurysm (AAA): A life-threatening condition that requires immediate surgical intervention, characterized by severe abdominal pain and potentially hypotension.
Perforated Viscus: A hole in the wall of the stomach or intestines, which can cause severe abdominal pain and peritonitis, requiring emergency surgery.
Pancreatitis: Inflammation of the pancreas, which can cause severe abdominal pain and requires prompt medical attention.

Intestinal Obstruction: Blockage of the intestines, which can cause abdominal pain, nausea, and vomiting, and is less common in older adults without a history of surgery or hernias.
Inflammatory Bowel Disease (IBD): Conditions like Crohn's disease or ulcerative colitis, which can cause abdominal pain and are less common in older adults.
Abdominal Cancer: Various types of cancer that can cause abdominal pain, such as stomach, colon, or pancreatic cancer, which may be less common but should be considered in the differential diagnosis.