The earliest known runestone dated to 50 BC–AD 275 at Tandemlab

Read in latest issue of Antiquity about what might be the world’s oldest known runestone

Check out the latest issue of Antiquity with a focus on archaeological science.
The issue includes the article “Inscribed sandstone fragments of Hole, Norway: radiocarbon dates provide insight into rune-stone traditions” by Steinar Solheim and colleagues, which describes sandstones dated with radiocarbon dating by the Tandem Lab to 50 BC–AD 275.

This makes it the earliest known runestone!