# Is the half life of carbon 14 5730 years?

The figure $5730$ years seems to be the middle estimate for the half life of $\text{^14"C}$, with uncertainty $\pm 40$ years.
The value has been calculated by correlating $\text{^14"C}$ / $\text{^12"C}$ ratios with other indicators of age such as comparing tree-ring dates of trees whose lifetimes overlapped.
Trees such as Bristlecone pines can live to ages in excess of $6000$ years, so a couple of Bristlecone pines with overlapping lifetimes, but dying a few thousand years apart could in theory provide some very useful data for such calibration.