Border Collie Age Calculator
The Border Collie is a medium breed (20 to 50 lbs) that typically lives 12 to 15 years. Enter your dog's age to see it in human years.
Your Border Collie is about
29 human years
Life stage: Adult · Medium breed
This uses the modern size-adjusted method, not the old "multiply by 7" rule. It's a close estimate, not an exact figure.
Border Collie age chart
| Border Collie age | Human years | Life stage |
|---|---|---|
| 1 year | 15 | Adolescent |
| 2 years | 24 | Adult |
| 3 years | 29 | Adult |
| 4 years | 34 | Adult |
| 5 years | 39 | Adult |
| 6 years | 44 | Adult |
| 7 years | 49 | Mature |
| 8 years | 54 | Mature |
| 9 years | 59 | Mature |
| 10 years | 64 | Senior |
| 11 years | 69 | Senior |
| 12 years | 74 | Senior |
| 13 years | 79 | Senior |
| 14 years | 84 | Senior |
| 15 years | 89 | Senior |
| 16 years | 94 | Senior |
Frequently asked questions
How old is a Border Collie in human years?
It depends on their exact age. As a medium breed, a Border Collie's first year is about 15 human years, and by age 2 they're around 24. After that each year adds roughly 5 human years. Use the calculator above for your dog's exact age.
How long do Border Collies live?
Border Collies typically live 12 to 15 years. Good nutrition, regular vet checkups, dental care, and a healthy weight all help your dog live a longer, more comfortable life.
Is the "multiply by 7" rule accurate for a Border Collie?
No. That old rule overestimates aging in the early years and ignores size. This calculator uses the modern size-adjusted method instead, which is a much closer estimate for a Border Collie.
This is a general estimate using the size-adjusted method, not an exact figure or medical advice. Your vet can best assess your dog's life stage and health.
Other medium breeds
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