Dog Age Calculator

The 7x rule assumes aging is linear, but dogs mature much faster in their first two years. A 1-year-old dog is roughly equivalent to a 30-year-old human in terms of biological maturity. After that, aging slows down significantly.

The 2019 UCSD study found that dog aging follows an epigenetic clock based on DNA methylation. The formula is 16 x ln(dog age) + 31, which accounts for rapid early development and slower aging later. It was developed by comparing methylation patterns between dogs and humans.

Yes. Large breeds tend to age faster and have shorter lifespans than small breeds. A Great Dane is considered senior at 6-7 years, while a Chihuahua may not reach senior status until 10-11 years. This calculator uses the general logarithmic formula, which is most accurate for medium-sized dogs.

Cats reach maturity at around 2 years old, equivalent to about 24 human years. After that, each cat year adds roughly 4 human years. Indoor cats tend to live longer than outdoor cats, with averages of 12-18 years versus 5-10 years.