How can we determine the half life of C14 is 5,730 (+ or -) years, when we haven't lived to see it? How is it quantifiable evidence without a longitudinal study where we actually observe it decaying and time-line the data?
Another problem is the assumption that the rate of decay has been constant over the eons...
Is there any accounting for unseen energy between two objects as well as radioactive changes in the atmosphere, global changes (ice age/slows decay and warmer climates which increases decay) and lastly anti-matter.
Would any of those have an effect that would alter the decay time substantially enough to be relevant in the process.