40-60 million Americans suffer from allergies. Allergies are most common in children and they can appear at any time and any age. There are several factors that that determine a person’s susceptibility to allergies, such as hereditary factors. If a parent has allergies, there is a 25-40% change a child will also have allergies. However, there is no specific gene that has been identified in humans.
Allergies that start in childhood can improve as one gets older. Allergies can also be developed as one gets older. Allergies can also disappear and return years later as a person’s chemistry changes.
Some people are prone to airborne allergens which can cause something known allergic rhinitis. This type occurs in about 15% to 20% of Americans. It typically develops by 10 years of age and reaches its peak in the early 20’s, with symptoms often disappearing between the ages of 40 and 60.
Underlying immune disorders can also contribute on how severe allergies can be. Individuals with a weak immune system have a higher chance at developing more severe allergies or increasing chances of becoming allergic to certain allergens. Weak immune systems are problematic due to the body being unable to defend or repair itself efficiently.