Collie Age Calculator
Collies are a large breed typically weighing 50–75 lb (22.7–34 kg) at adulthood. Typical lifespan is 12–14 years.
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Personalised, breed-aware, with two scientific methods compared. Enter your dog's details below.
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- West Highland White Terrier small
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That's about the same as a human young adult.
Adult — Prime adult years; maintain weight and dental care.
How this number was calculated (and other methods)
| AKC size-based method (recommended) | — |
| Wang epigenetic-clock (2020) Labrador-derived; small-breed accuracy unverified | — |
| Old "× 7" rule | — |
| Typical breed lifespan | — |
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How a Collie ages
Like all dogs, a Collie ages rapidly in the first two years — roughly 15 human years in year one, then another 9 in year two. From age two onward, a Collie ages about 6 human years for every dog year, in line with their large breed classification. That means a 7-year-old Collie is roughly 54 in human years.
Individual lifespan varies with diet, exercise, dental care, and genetics. Collies often outlive the average by 1–3 years when maintained at a healthy weight and given consistent veterinary care.
Collie age conversion at a glance
| Collie age | Human-equivalent |
|---|---|
| 1 year | 15 human years |
| 2 years | 24 human years |
| 5 years | 42 human years |
| 7 years | 54 human years |
| 10 years | 72 human years |
| 13 years | 90 human years |
Common health concerns to watch for
- Hip dysplasia and arthritis
- Gastric torsion (bloat) in deep-chested individuals
- Cruciate ligament injuries
- Cardiomyopathy in some bloodlines
This is general guidance based on size and breed averages. Always discuss specific concerns with your veterinarian.
Similar breeds you might be comparing
- Airedale Terrier — large breed, 11–14 year lifespan
- Alaskan Malamute — large breed, 10–14 year lifespan
- American Bulldog — large breed, 10–12 year lifespan
- Compare two dogs side-by-side →
Methodology: AKC size-based formula. See the main dog age calculator for full method comparison (including the Wang epigenetic-clock formula), life-stage guidelines, and citations.
Collie age FAQ
How old is a 7-year-old Collie in human years?
Using the AKC size-based method, a 7-year-old Collie is approximately 54 human years old. Try the calculator above with your dog's actual age and months for a precise answer.
What is the typical lifespan of a Collie?
Collies typically live 12–14 years. Individual lifespan varies with diet, exercise, dental care, and genetics. Collies often outlive the average by 1–3 years when maintained at a healthy weight and given consistent veterinary care.
When does a Collie become a senior?
As a large-sized breed, a Collie is generally considered senior at around 7 years old. Senior status signals a shift toward semi-annual veterinary check-ups and closer monitoring for arthritis, dental disease, and weight changes.
Are Collies long-lived?
Collies have an average lifespan for their size. Diet, exercise, and dental care are the strongest modifiable factors for longevity.