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We can use scientific techniques in the present, combined with assumptions about historical events, to estimate the age.
Proponents of evolution publicize radioisotope dating as a reliable and consistent method for obtaining absolute ages of rocks and the age of the earth.
During the molten state it is assumed that the intense heat will force any gaseous daughter elements like argon to escape.
Once the rock cools it is assumed that no more atoms can escape and any daughter element found in a rock will be the result of radioactive decay.
Half-lives as measured today are very accurate, even the extremely slow half-lives.
That is, billion-year half-lives can be measured statistically in just hours of time.