Twin Ritual.

From ScienceShots:

Anthropologists working in eastern Austria have uncovered the bodies of three infants buried by hunter gatherers 27,000 years ago. Two appear to be twins because they were buried together and have leg bones that are the same length. Although babies buried by Neandertals and modern humans have been found that date farther back, the new bodies are unusual in that they are adorned with ivory beads, red ochre, and mammoth bone. That makes this the oldest evidence of the ornate decoration of infants in the human fossil record, indicating a shift to a more modern social behavior in this Stone Age culture.

The 27,000 years is a guess and could be a little as 100 years old. Anthropologists have no foolproof way of knowing the date of items found. Accurate methods of testing has yet to be found.

I wish they would just say "We Think it is xxx old" instead of just picking a number out of thin air.