What age group is most commonly affected by gastric adenocarcinoma?

Gastric adenocarcinoma, also known as stomach cancer, primarily affects older individuals, with the highest incidence occurring in those over 40 years of age. The risk of developing this type of cancer increases significantly with age, and it is most commonly diagnosed in individuals in their 60s and 70s. Factors that contribute to the development of gastric adenocarcinoma include long-term inflammation of the stomach lining, infection with Helicobacter pylori, dietary factors, and certain genetic predispositions, all of which tend to become more prevalent as individuals age. Therefore, recognizing that the majority of cases occur in those over 40 is crucial for understanding the epidemiology of this disease and allows for better screening and prevention strategies in the appropriate age groups.