FACT: Food allergy can develop at any age, though it tends to occur in childhood. Further, food allergy is more common in young children than in older children or adults; some allergies may be outgrown while others can be lifelong. It is a possibility to develop food allergy in adulthood; fish, crustaceans (e.g. lobster, shrimp) and molluscs (e.g. scallops, clams) are usually described as the most common adult-onset food allergies.