Boston Terrier Age Calculator: Dog Years to Human Years

Boston Terrier age in human years

Dog years	Human years	Life stage
1	15	Adolescent
2	24	Adult
6	40	Adult
10	56	Senior begins
13	68	Senior
15	76	Geriatric

Figures based on The Royal Kennel Club's published small-breed guidance, as tabulated by Purina UK. For an exact figure, try the Dog Years calculator.

The Boston Terrier is classified by The Royal Kennel Club within the smaller ageing band, typically weighing 4.5–11 kg as an adult, with a median life expectancy of around 11.8 years, according to a 2024 analysis of UK veterinary records by Dogs Trust. Known for its distinctive black-and-white "tuxedo" markings, the Boston Terrier is a friendly, adaptable companion breed with a moderately flat face.

What this means for your Boston Terrier

Boston Terriers have a moderately brachycephalic (flat) face, which can mean laboured breathing in hot weather or with excitement — though generally less severe than in breeds like the Bulldog or Pug. Their large, prominent eyes are also more prone to injury and corneal ulcers than in longer-nosed breeds, so keeping an eye out for excessive tearing or squinting matters as they age.

The breed is prone to luxating patella (a dislocating kneecap) and can be sensitive to heat, so exercise is best kept to cooler parts of the day, especially for older dogs. Dental crowding is also common given the breed's small jaw.

When is a Boston Terrier considered a senior?

Under The Royal Kennel Club's size-adjusted guidance, small breeds like the Boston Terrier are generally considered senior from around 10 dog years old.

Related reading: Is the ×7 Rule Real? · Dog Life Stages Explained · Signs Your Dog Is Entering Its Senior Years

Compare: vs French Bulldog · vs Pug · vs Bulldog