I always thought it humorous how the WT scoffed at the ages mentioned in the Sumerian King's list even though Sumerian scholars recognize that the vast ages must have been concocted to agree with some other agenda or were simply bad translations of Sumerian numbering systems from earlier times.
After all, believing in a 1000 year old man is much more reasonable than believing in a 10,000 or 100,000 year old man, right?