Mastiff age in human years

Mastiff age calculator

Age (years)

+ months

Size class

Mastiff years to human years

Mastiff age	Human years	Stage
1	12	young adult
2	22	young adult
3	31	young adult
4	38	young adult
5	45	mature adult
6	49	mature adult
7	56	mature adult
8	64	senior
9	71	senior
10	79	senior
11	86	senior
12	93	senior

Uses the giant (over 100 lb) curve. Typical life expectancy: 6-10 years.

FAQ

How old is my Mastiff in human years?

Mastiffs are a giant breed: a 5-year-old is about 45 and a 10-year-old about 79 in human years.

How long do Mastiffs live?

Typical life expectancy is about 6-10 years (breed club and kennel club figures; individual dogs vary).

Other giant breeds

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