As we have mentioned before each radioactive isotope has its own decay pattern.
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Carbon-14 cannot be used to date biological artifacts of organisms that did not get their carbon dioxide from the air.
This rules out carbon dating for most aquatic organisms, because they often obtain at least some of their carbon from dissolved carbonate rock.
But the radiocarbon detected in diamonds is equivalent to ages of up to 80,000 years.
So you can see why the various age limits have appeared in different publications of ours.
Levels of carbon-14 become difficult to measure and compare after about 50,000 years (between 8 and 9 half lives; where 1% of the original carbon-14 would remain undecayed).