Estimates of the age of the Earth made prior to about 1950, biblical or otherwise, are all wrong, because they were based on methods now known to be … - Brent Dalrymple

These calculations result in ages for the Earth of 4.52 to 4.56 Ga. Probably the best value is 4.54 Ga, found by (Fouad) Tera using the congruency point of the four oldest conformable lead ores. Its value, which is known to within 1% or better, is consistent with the ages of meteorites, the ages of the oldest lunar samples, and the ages of the oldest Earth rocks.

I was not overly enthusiastic about appearing in court. The goal of both the courts and science is to discover the truth, but the methods of the two are so different that it is difficult for most scientists to enter the legal arena with any degree of confidence. Finally, there was a natural reluctance, common to most scientists, to spend any time dealing with nonsense; the tenets of “scientific” creationism are so absurd that it seems most appropriate simply to ignore them.

There is incontrovertible evidence from lead-isotopic data that meteorites are approximately 4.55 ± 0.02 Ga. We can presume, as the evidence indicates, that the solid bodies of the Solar System formed nearly simultaneously, and conclude that the Pb-Pb age of meteorites also represents the age of Earth.