Mastiff age in human years
The Mastiff is a giant breed weighing 120–230 lb, with a typical life expectancy of 6–10 years. On the size-based vet chart, a 5-year-old Mastiff is about 45 in human years, and the breed is usually considered senior from around 6 years old. It belongs to the Working group.
Enter an age to see human years.
The default is the size-based vet chart. See how pet age is calculated.
Mastiff facts
- Size
- Giant (over 100 lb)
- Weight
- 120–230 lb
- Life expectancy
- 6–10 years
- Senior from
- About 6 years old
- Breed group
- Working
Mastiff age in human years
| Dog age | Giant | Life stage |
|---|---|---|
| 1 year | 12 | Puppy |
| 2 years | 22 | Young adult |
| 3 years | 31 | Mature adult |
| 4 years | 38 | Mature adult |
| 5 years | 45 | Mature adult |
| 6 years | 49 | Senior |
| 7 years | 56 | Senior |
| 8 years | 64 | Senior |
| 9 years | 71 | Senior |
| 10 years | 79 | Senior |
| 11 years | 86 | Senior |
| 12 years | 93 | Senior |
The default is the size-based vet chart. See how pet age is calculated.
Other giant dog breeds
FAQ
How old is a Mastiff in human years?
The Mastiff is a giant breed weighing 120–230 lb, with a typical life expectancy of 6–10 years. On the size-based vet chart, a 5-year-old Mastiff is about 45 in human years, and the breed is usually considered senior from around 6 years old. It belongs to the Working group.
How old is a 3-year-old Mastiff in human years?
About 31, using the vet chart for giant dogs. A 10-year-old Mastiff is about 79.
What is the life expectancy of a Mastiff?
Most live 6–10 years.
When is a Mastiff considered a senior?
From around 6 years old, the last quarter of its expected lifespan. That is about 49 in human years.