Forum:Jake's age

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In the original pilot of adventure time,  Jake mentions that he is 28 years old. Now, this is unknown whether it is counted in dog years or whether it is human years. In dog years, he would be 4. Either way, his age would not make sense. Now, I personally think that the idea of dog years would most likely get lost over years after many people being wiped out from the mushroom war and a lack of humans but it could have stayed through tribes of humans like the ones that Finn must have been left from. The reason Jake's age would not make sense is because, in the episode, "Dad's Dungeon", Finn and Jake are shown together, as babies. Finn is 13, so if they were born around the same time and grew up together, Jake could not be 28 or 4. Possible ways of this happening could be because Jake stayed with the appearance of a baby for a long period of time or because his mother and father lied to him about his age. Why don't you share your thoughts and theories in the comments?