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This radioactive carbon 14 slowly decays back into normal, stable nitrogen.Extensive laboratory testing has shown that about half of the C-14 molecules will decay in 5730 years. After another 5730 years half of the remaining C-14 will decay leaving only ¼ of the original C-14. In theory it would never totally disappear, but after about 5 half lives the difference is not measurable with any degree of accuracy.
Neither of these assumptions is provable or reasonable.
One gram of carbon from living plant material causes a Geiger counter to click 16 times per minute as the C-14 decays.