Hello thanks for using health care magic For sure celiac disease occurs in people of all ages who are genetically predisposed to having the disease. In celiac disease, the body produces antibodies against a give protein called gluten that resembles some cells of the body. thus, these antibodies as they target the proteins, body cells (intestinal lining cells) are not left out. The antibodies are produced following sensitisation and the precise time of sensitisation varies from individual to individual, thus you might have been tested at a time, you had not developed the antibodies. I will recommend you do testing again to be sure of the real situation. Best regards Dr Achuo