Small dog
Boston Terrier age in human years
Enter your Boston Terrier's age to see its human-year equivalent, life stage, and lifespan.
Frequently asked questions
How old is a Boston Terrier in human years?+
It depends on the dog's age and size. Enter your Boston Terrier's age above. We use a size-based model (not the inaccurate "multiply by 7" rule), since the first two years count for the most and larger dogs age faster.
What is the average lifespan of a Boston Terrier?+
Boston Terriers typically live about 12–16 years.
When is a Boston Terrier considered a senior?+
Around 10 years. After that, more frequent vet checkups, joint support, and dental care become important.
Boston Terrier age chart
Swipe the table sideways to see all columns.
| Age | Human age | Life stage |
|---|---|---|
| 3 months | About 5 | Puppy |
| 6 months | About 10 | Puppy |
| 9 months | About 14 | Young Adult |
| 1 year | About 15 | Young Adult |
| 2 years | About 24 | Adult |
| 3 years | About 29 | Adult |
| 4 years | About 33 | Adult |
| 5 years | About 38 | Adult |
| 6 years | About 42 | Adult |
| 7 years | About 47 | Adult |
| 8 years | About 51 | Adult |
| 9 years | About 56 | Adult |
| 10 years | About 60 | Senior |
| 11 years | About 65 | Senior |
| 12 years | About 69 | Senior |
| 13 years | About 74 | Senior |
| 14 years | About 78 | Senior |
| 15 years | About 83 | Senior |
| 16 years | About 87 | Senior |
| 17 years | About 92 | Senior |
| 18 years | About 96 | Senior |
| 19 years | About 101 | Senior |
| 20 years | About 105 | Senior |
This chart is a general estimate. Real aging varies with genetics, weight, health, diet, and veterinary care.