Dog owners often use the “seven-year-rule” to calculate their dog’s age in human years - simply multiply your dog’s age by 7. This would make my 13-year-old Labrador retriever 91 years old in human years.
This calculation is not supported by science, so how did this calculation evolve? The most common explanation is that in the early 1950’s, when this calculation became popular, the average life expectancy of a human was about 70 years and canines about 10 years; thus the 7:1 ratio became a logical (and easy) way to calculate a dog’s age in human years.
But new scientific research suggests there is a more accurate way to calculate your dog’s age in human years.