No. Some people THINK there's an exact number of years, but there ain't. Like I said, the various translations--Septuagint, Peshitta, Masoretic text--give different numbers for those geneologies, and they may not even be exhaustive. When you open up your King James or whatever, the translator made a decision which ancient authority to follow. That decision may or may not be correct--but it sure ain't infallible.
And we do not know with certainty the date of Christ's birth either.
The Masoretic text is the only authoritative text. It is not a translation, while the others are.
If you had any understanding of how the masoretic has been carried foreward you wouldn’t make such silly statements.
If the geneologies were not exhaustive, there would be no point for them to exist. There are believers, and there are unbelievers.
And yes we do know with complete certainty the exact date of Christs birth. We know the exact day because we know that it had to be on the Feast of Tabernacles, and on a sabatical cycle, while agreeing with the other historic events cited in the word.
To those that want to know its not difficult; to those that don’t there is no point in discussion.
I would also say that it's not important how old the earth is because even Christ said that not even He knows when God will choose to send Him back. There is no benefit of knowing how old the earth is because there is nothing of significance to measure with it. If we could find out how old the earth is and then use that as a basis for when Jesus will return, then that would be a whole other story.