* Genetics: Some bloodlines may have a predisposition to certain health problems, which can shorten their lifespan.
* Environment: Proper nutrition, exercise, and veterinary care can all contribute to a longer life.
* Lifestyle: Horses used for strenuous activities may experience more wear and tear on their bodies, which can lead to shorter lifespans.
* Disease: Certain diseases can significantly shorten a horse's lifespan.
While some Quarter Horses may live longer than 25 years, it's not uncommon for them to live into their late teens or early twenties.