How horses age
Horses do most of their growing up in the first few years, reaching young adulthood around age four. That early speed is why those first years map to so many human years. After maturity, aging slows to roughly two and a half human years for each horse year, which is why a horse in its teens is still in its prime.
Caring for an aging horse
As horses move into their senior years, regular dental checks, joint support and a diet suited to older teeth become more important. Watch weight, mobility and coat condition, and schedule routine veterinary and farrier visits. Knowing the human-equivalent age helps you anticipate these needs and keep an older horse comfortable.