Suggested Articles Lymphoma Feline Vaccines: Benefits and Risks Diarrhea Neurological Disorders Feline Vision Problems: A Host of Possible Causes Feline leukemia virus (FeLV) is one of the most common and important infectious diseases in cats, affecting between 2-3% of all cats in the United States and Canada. Infection rates are significantly higher (up to 30%) in cats that are ill or ...
Feline leukemia virus (FeLV) affects a significant, though declining, percentage of cats worldwide; while prevalence varies geographically and by lifestyle, its estimated that 26% of cats are infected, making FeLV a serious health concern.

Feline leukemia virus (FeLV) is a serious concern for cat owners, but just how common is it? Understanding the prevalence of this virus can help you make informed decisions about your cats health.

A 10-year-old cat would be 54, a 15-year-old cat 74, and a 20-year-old cat would be 94 cat years of age. Experts differ as to when one would consider an aging cat to be "geriatric," but you can select your own cut-off based on this comparison to the equivalent age in humans.
Increasing age goes hand-in-hand with changes to a cats physiology, behaviour and vulnerability to particular illnesses. This collection has been created to highlight some of these age-related issues challenging our geriatric cats. Last updated 2025.