Ageing Horses: How to Tell a Horse’s Age (and Care for an Older One)
People search for “ageing horses” for two different reasons: to work out how old a horse is, and to care for one that is getting on in years. This guide covers both. It starts with the classic method of reading a horse’s age from its teeth, then moves to the wider signs of aging and how to keep an older horse comfortable.
Can you really tell a horse’s age by its teeth?
Estimating a horse’s age by its teeth is not an exact science, but a horse’s incisors change in fairly predictable ways, so you can get reasonably close, especially when there are no registration papers. Horsemen and veterinarians have read age from the mouth for centuries, which is where sayings like “long in the tooth” and “don’t look a gift horse in the mouth” come from. Treat any estimate as approximate: diet, environment, and cribbing all affect wear.
How to age a horse by its teeth
Tooth eruption in young horses
Foals are born without incisors. Deciduous (baby) teeth come in over the first months, then permanent incisors replace them on a schedule. A horse is said to have a “full mouth” of permanent teeth at about five years old, which is the easiest age to read with confidence.
Cups and the dental star
The biting surface of the lower incisors has small hollows called “cups.” They wear away in order: from the central pair at around six years, the middle pair around seven, and the corner pair around eight. Around the same stage, the “dental star” appears on the chewing surface, first as a line and later as a round mark.
Galvayne’s groove
Galvayne’s groove is a dark line that appears at the gumline of the upper corner incisor at roughly ten years of age. It extends about halfway down the tooth by fifteen, reaches the full length by about twenty, then recedes from the top and is usually gone by about thirty.
Angle and shape of the incisors
Young horses’ incisors meet nearly straight up and down. With age, the teeth angle forward and the biting surface changes shape from oval to round to triangular. As a rule of thumb, the more slanted the profile, the older the horse.
| Approximate age | What the teeth show |
|---|---|
| ~5 years | Full mouth of permanent teeth |
| ~6 years | Cups gone from the central incisors |
| ~7 years | Cups gone from the middle incisors |
| ~8 years | Cups gone from the corner incisors; dental star appears |
| ~10 years | Galvayne’s groove appears at the gumline |
| ~15 years | Galvayne’s groove about halfway down the tooth |
| ~20 years | Groove full length; incisors clearly angled forward |
| ~30 years | Galvayne’s groove receding or gone |
These are general guidelines. Aging by teeth is an estimate, not a birth certificate, and a veterinarian or equine dentist can read a mouth far more precisely.
How old is that in human years?
Horses mature quickly early in life and then age more gradually. A three-year-old horse is closer to a young adult than a toddler, and a horse in its early twenties is roughly comparable to a human in their sixties. We break down the full comparison in our guide to horse years to human years.
Signs a horse is getting older (beyond the teeth)
Ageing shows up differently in every horse, but common cues include:
- Grey hairs, especially around the eyes and muzzle
- A dipped back, with more prominent withers and hips
- Stiffness, slower movement, or signs of arthritis
- Changes in weight and loss of topline muscle
- Slower, messier eating
None of these means a horse is unwell. They are simply signals to adjust care.
Caring for an ageing horse
Supporting an older horse comes down to a few habits: stay ahead of dental care so the horse can chew (see old horse teeth), adjust the diet to the individual horse rather than the calendar (see how to feed a senior horse), keep up routine veterinary and farrier care, provide soft footing and shelter, and keep the horse gently moving and in the company of other horses.
Ageing horses at Mane Characters
A real retirement is the whole point of what we do. Many of our horses are in their senior years, cared for as individuals for the rest of their lives. Mane Characters Equine Reserve & Retirement is located at Maplehurst Stock Farm in Bourbon County, Kentucky.
You can meet the horses or support an older horse’s care by sponsoring a horse.
Every horse, a tale to tell. Every tale, a Mane Character.
Frequently asked questions
At what age is a horse considered old?
Horses are commonly considered senior from about fifteen, but it varies widely with the individual horse’s health and care.
Can you tell a horse’s exact age from its teeth?
No. Teeth give a close estimate, not an exact age. A veterinarian or equine dentist can read a mouth most accurately.
What is Galvayne’s groove?
A dark groove on the upper corner incisor that appears around age ten and changes predictably with age, helping estimate older horses.
How long do horses live?
With good care, many horses live into their late twenties and some beyond. See our guide to horse lifespan.
This article is general educational information. For a specific horse, consult your veterinarian or a qualified equine dental professional.