Dogs age at different rates. How old they get depends on the breed and size. Large, heavy dogs age faster than small breeds. Small breeds mature earlier.
In young years the dog ages faster, later slower. The rule of thumb ‘1 dog year corresponds to 7 human years’ is only partially correct.
The oldest known wirehaired dachshund (Chanel from New York / USA) became 21 years old. This corresponds to 103 years in human years.
This table shows the age table for dachshunds.