Large breed

Collie age in human years

Collies are a large breed. Here is the full age chart and what each stage means.

Updated October 2026Numbers calculated for this page

Collies are a large breed (typically 50–75 lb), so they age about 6 human years for every dog year after age two. A 5-year-old Collie is about 42 in human years, and the senior years usually start around age 10.

12–14 yrstypical life expectancy

96human years at age 14

~10senior years begin

50–75 lbtypical adult weight

Collie age chart

Dog age	Human years	Life stage
1 year	15	Young adult
2 years	24	Young adult
3 years	30	Mature adult
4 years	36	Mature adult
5 years	42	Mature adult
6 years	48	Mature adult
7 years	54	Mature adult
8 years	60	Mature adult
9 years	66	Mature adult
10 years	72	Senior
11 years	78	Senior
12 years	84	Senior
13 years	90	Senior
14 years	96	Golden years
15 years	102	Golden years
16 years	108	Golden years

Uses the common size-based chart: the first year equals about 15 human years, the second adds about 9, and each year after that adds 4 (small), 5 (medium), 6 (large) or 7 (giant). It is an estimate, not a medical measure.

What each stage means for a Collie

Young adult (1–3): still learning. Keep training consistent and set the healthy weight now; for a Collie that is usually within 50–75 lb.
Mature adult (3–9): yearly checkups, dental care and steady exercise. Watch the waistline as activity drops.
Senior (10+): many vets suggest checkups every six months, plus attention to joints, teeth and weight changes.

How much a Collie eats

A spayed or neutered adult around 62 lb needs roughly 1,380 calories a day, about 3.6 cups of a typical 380-calorie-per-cup dry food. See the full feeding guide for a 60 lb dog.

Planning the budget? See what a Collie costs per year.

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Other large breeds

Labrador Retriever Golden Retriever German Shepherd German Shorthaired Pointer Doberman Pinscher Boxer Bernese Mountain Dog Belgian Malinois Weimaraner Rhodesian Ridgeback

Any large dog: see how old a 7-year-old large dog is or try the dog age calculator.

Questions people ask

How old is a 10-year-old Collie in human years?

About 72, using the large-breed chart.

How long do Collies live?

Typically 12 to 14 years, though genetics, weight, diet and vet care all matter.

When is a Collie considered a senior?

Around age 10, roughly the last quarter of the breed's typical lifespan.

The Paw Plan shares general pet care information, not veterinary advice. Figures on this page are estimates calculated from the assumptions shown. Every pet is different, so check with your vet about yours.