Over the last 75 years numerous determinations have been made of the 176Lu half-life and decay constant. However, even though the measurement technology has improved, the determinations over the last 30 years have resulted in unexplained and unresolved discrepancies. Direct physical counting experiments have resulted in two separate groupings of results with different 176Lu mean half-life values. Early determinations based on comparisons of ages of meteorites gave different 176Lu half-life and decay constant values than determinations based on comparisons of ages of terrestrial minerals and rocks. But more recent determinations using meteorites have yielded 176Lu half-life and decay constant values that agree with both determinations based on comparisons of ages of terrestrial minerals and rocks, and with one of the groupings of determinations by direct physical counting experiments. Thus the 176Lu half-life and decay constant values of 37.12 Byr and 1.867 × 10-11 per year respectively have now been generally adopted for standard use by the geological community, based particularly on the determinations using comparisons of ages of terrestrial minerals and rocks. The more recent meteorite determinations used chondrite meteorites rather than the eucrite meteorites used for the earlier determinations, because it was realized the latter have suffered thermal and shock metamorphism that resulted in significant disturbance of the Lu-Hf systematics among mineral phases due to open geochemical system behavior, such as leakage of 176Hf. Yet the discrepancies in the determinations by the direct physical counting experiments remain unexplained and unresolved. Furthermore, all the determinations using age comparisons on terrestrial minerals and rocks and most of the more recent determinations using age comparisons on chondrite meteorites have been calibrated against the U-Pb method, but even this "gold standard" has unresolved uncertainties due to variations measured in terrestrial rocks and minerals and meteorites of the 238U/235U ratio which is so critical to the method. So the U-Pb method should not be used as a standard to determine other decay constants. This only serves to highlight that if the Lu-Hf dating method has been calibrated against the U-Pb "gold standard" with its own uncertainties, then it cannot be absolute, and therefore it cannot be used to reject the young-earth creationist timescale. Indeed, current radioisotope dating methodologies are at best hypotheses based on extrapolating current measurements and observations back into an assumed deep time history for the cosmos.