Here are some factors that can affect a horse's lifespan:
* Breed: Some breeds, like ponies and draft horses, tend to live longer than others.
* Genetics: Just like in humans, some horses are predisposed to certain health conditions that can shorten their lifespan.
* Environment: A healthy environment with good nutrition, proper housing, and regular veterinary care can significantly extend a horse's life.
* Management: Proper training, exercise, and care can contribute to a long and healthy life for a horse.
It's important to note that these are just general guidelines. Each horse is an individual, and their lifespan can vary significantly.