Aging is not a disease. It occurs in all organisms if they live long enough! Some definitions that are helpful when speaking about aging include life span, life expectancy, chronologic age, biologic age and demographic age.
Recurrent airway obstruction (RAO, or heaves) and inflammatory airway disease (IAD) are highly prevalent in stabled horses, and require treatment with corticosteroids and bronchodilators in addition to environmental modification.
The three most common gastrointestinal problems that are seen in the foal include colic, gastric ulcer disease and diarrhea. Though these are also common in the adult the foal has different specific etiologies and treatments.
Approximately 80% of stabled horses show evidence of airway inflammation, and a recent survey performed by the Tufts Cummings School of Veterinary Medicine shows that at least 25% of horses show overt signs of inflammatory airway disease, such as cough or exercise intolerance.