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One half-life is the amount of time required for of the original atoms in a sample to decay.
Over the second half-life, of the atoms remaining decay, which leaves of the original quantity, and so on.
For instance, a date of 100,000 5,000 years ago means that there is a high probability the date is in the range of 95,000 and 105,000 years ago and most likely is around 100,000.
Radiometric dates, like all measurements in science, are close statistical approximations rather than absolutes.
This allows the dating of much older and smaller samples but at a far higher cost.