What are the symptoms of gastroesophageal reflux disease (GERD) in older adults? (Select all that apply.)

A. Heartburn: Classic symptom of GERD, though older adults may experience it less prominently than younger adults. B. Vomiting: GERD can cause reflux that leads to nausea and vomiting, especially in more advanced cases or with impaired esophageal motility. C. Abdominal pain within 1 hour of eating: Postprandial abdominal discomfort is common due to acid reflux worsening with gastric distention. D. Fever and elevated white blood cell count: These are signs of infection, not GERD. GERD is not typically associated with systemic signs like fever or leukocytosis. E. Regurgitation: A common symptom in GERD, especially in older adults, due to weakened lower esophageal sphincter tone.