Eight out of 10 children have had glue ear at least once by the time they are It's most common between the ages of one and six. Adults can also get glue ear. Apr 4, - Glue ear is a condition where the middle ear fills with glue-like fluid instead of air. This causes Rarely, some adults are troubled with glue ear.What is glue ear? · What causes glue ear? · Glue ear symptoms · Glue ear treatment.