Dating age 16
This results in a range of X-values for the data points representing individual minerals.
Since the data points have the same Y-value and a range of X-values, they initially fall on a horizontal line: half-lives will include zero within its range of uncertainty.
There is no good way to tell how close the computed result is likely to be to the actual age.
Consider some molten rock in which isotopes and elements are distributed in a reasonably homogeneous manner.
General comments on "dating assumptions" All radiometric dating methods require, in order to produce accurate ages, certain initial conditions and lack of contamination over time.