age
Imagine an average human's lifespan is about 80 years (assuming they die naturally). Actually it is more like 70 but this makes the math easier. Abe is 15 and will live to about forty. If you do the math he would actually be about 30 years old if he had a human lifespan.
So he isn't really as young as you think when you consider the lifespan. Same with Munch.
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