As such, the absorption rate is fairly constant, that is, until death starts to kick in.
When an animal dies, the animal stops absorbing carbon, for the obvious reason that it no longer can consume food.
In short, the older the object, the wider the discrepancy.
Any fossil more than 60,000 yrs old would have too little C-14 to carry out any meaningful C-14 dating.
The real problems of C-14 and its so-called erroneous readings, however, have more to do with the natural elements than the consistency of its decay.1.