Ouroboros
Coincidentia oppositorum
There are over 50 different methods. Some of them are radioactive. Some chemical. Some basic physics, using geological facts and simple math. And even other methods relating to well known processes of biological nature (like tree rings). And they all say the same things... how can all of them be wrong together and give the same wrong answers?As to the age of bones, scientific dating is speculative and unreliable past just a few thousand years, IMO.
The only "speculative" nature of some of the methods are that they sometimes can give false readings based on the environment they're in. For instance, the challenge with radiometric dating is to know how much of the isotope was in the sample when the decay started, but luckily, there are ways of figure that out within certain margins of errors. Carbon dating for instance, there's only a limited amount of C12 and C14 in a sample. There can't be more than it is, and in face, if the samples were any younger (like 6,000 years), there would be plenty of C14 left in the sample, and there isn't. When C14 is gone, it must be older than some 50,000 years, because that's how long it takes for most of it to decay. Unless you have some clever explanation to how C14 disappeared (or actually decayed to C12) happened faster against all our current (and well established) science, but there is none.