Posts: 606. i think that an average of 12 years is not too bad at all. the average life expectancy for a human male in north america is 77. if one dog yeah is equal to 7 human years that would make a 12 year old dog 84 in human years.ost dogs on average only live between 10-15 years. Dogs that get up older have been well cared for and well maintained thru their life. Our breed has a rough time making it to 5 years old just due to the average no good people that own them.