Why your dog isn't the age you think

They quantify aging by looking at how fast your cells are "produced" ,we eventually die because we are not capable to produce enough cells to sustain ourselves. You can measure the speed and thus you can quantify aging. Dogs age slower when they are older but the difference in speed of cell production in the beginning of their life is much bigger than for us humans. Btw this is a verry abstract explanation so dont correct me for using the wrong terms just to make it easier. And also excuse me for my English.