How old would a fossil be if it has only one eighth of its original carbon -14 content remaining?

Carbon-14 has a half-life of about 5,730 years, meaning it takes this long for half of the original carbon-14 in a sample to decay. If a fossil has one-eighth of its original carbon-14 content remaining, it has gone through three half-lives (half to one-half, half to one-quarter, and finally half to one-eighth). Therefore, the fossil would be approximately 17,190 years old (3 half-lives x 5,730 years).