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Note the consequence of the law of large numbers: with more atoms, the overall decay is more regular and more predictable.
However, unlike in an exponential decay, the half-life depends on the initial quantity, and the prospective half-life will change over time as the quantity decays.
As an example, the radioactive decay of carbon-14 is exponential with a half-life of 5,730 years.
A quantity of carbon-14 will decay to half of its original amount (on average) after 5,730 years, regardless of how big or small the original quantity was.
After another 5,730 years, one-quarter of the original will remain.
Circa (from Latin, meaning "around, about"), usually abbreviated c., ca. or cca.), means "approximately" in several European languages (and as a loanword in English), usually in reference to a date.