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Scientists (geologists/geochronologists) also use evidence to back up their claim that Mt Everest is very old. Their "educated guess" uses a lot more education/knowledge than guessing. You seem to be saying that they just made it up with no evidence to support it at all.

An analogy:

You are trying to determine a person's age. {snip}
Why bother with analogy when we have history? There were people who desired the Earth to be ancient beyond belief. They set about to find any evidence they could possibly misinterpret to support this claim. They took sediments and claimed that they accumulated slowly over millions of years rather than quickly as the result of deposition. Nobody believed their nonsense until they overthrew science and put their own people in place. After the takeover, they began searching for more backup, since the sediment story was so obviously false.

There's really no mystery at all here.

Dark Matter + Dark Energy = Dark Truth

"We find that such evidence demonstrates that the ID argument is dependent upon setting a scientifically unreasonable burden of proof for the theory of evolution." - Judge Jones Kitzmiller case
http://www.talkreason.org/articles/Falsify.cfm

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