I am just above 60. I have been tested and diagnosed allergic to Fish, Beef,Spices, Raw onion, Dairy products. All of these things cause itching rashes all over my body. Sometimes the rashes on the genitals are accompanied by swelling. Eating fish causes swollen tongue. Some doctors tell me that people above 50 do not experience allergy. These allergy symptoms started 3 years back. Now I avoid most of these food items but still I am getting rashes. The rashes last for 10 to 12 hours.