While all of these findings are accompanied by a +/- factor of a few thousand years the overwhelming evidence is Man is relatively old. It is corroborated by a variety of testable repeatable methods, and by scientists in a variety of disciplines. It is undeniable.
But it’s only undeniable if one accepts reality over blind faith. To over 50% of Americans, Archbishop James Ussher’s 17th century calculation of the Earth as only 6000+ years old based on biblical dating, is fact. Ussher declared that God formed the Earth on October 23rd, 4004 BC… with humans (Adam and Eve) following a few days later (approx 1:30 p.m. GMT, as I recall).
Some of these folks are just ignorant of the facts. Others, fundamentalists, hard core Evangelicals, know the facts and outright deny them. To them, Ussher’s calculation, the Bible’ inerrancy, over rule reality, modern science, and corroborating evidence. In the 21st century that’s what passes for reason for many Christians.
Those believers will adamantly insist that radiologic data , sedimentary layering, and every refined measurement at science’s disposal is flawed, faulty, inaccurate, thus meaningless. They will present ½ truths, pseudo-fact, and outright fiction in an attempt to discredit science, as though their faith depends on it. Why? Because their faith depends on it.
To these medieval minded folks once they admit their book of fables is not a science book, nor a book of history, nor the inerrant word of some super being, then their whole belief system comes into doubt. Their faith will be shaken to its core. Its foundation will collapse. Reality is a threat they will not / cannot tolerate if their belief is to survive. If they were able they would destroy every science book, and imprison or burn at the stake every paleontologist just as their early Church predecessors tried to do to halt knowledge and reason … the duel enemies of faith.
Instead, they wage a war of myth and misinformation. They build their Creationist museums repleat with dioramas of modern man riding dinosaurs. They home school their kids, stunt their minds, sacrificing their intellectual growth on the holy alter of blind faith and willful ignorance.
And they will tell their kids that some day they can grow up to become candidates for the office of President of the United States, like Huckabee, Brownback, Tancredo and Palin. And unfortunately in that regard they are correct.