Why your dog isn't the age you think

easy, it is not about quantify aging, but about life cycle. human evolve to have a much more develop brain but basicly zero instinct at born. while most animal not only dog, have a simpler brain but crazy instinct.

human has evolve to learn and study at young age, and then survive at later age. that's why we age slower at young. while animal has evolve to survive at young age. so they have to age and develop their body faster at young age.