The team, led by Giuseppe Intini, a bone biologist at the University of Pittsburgh, first compared the cell composition of the calvarial suture—which joins the bilateral bones in the roof of the skull ...

Look for the sagittal suture – the squiggly line that runs the length of the skull – and note whether is it's completely fused. If it is, the remains are likely to be of someone older than 35.

[3] Figure 1 illustrates the boney anatomy of the normal skull sutures and fontanelles. The newborn infant's skull is incompletely ossified and the cranial sutures are normally open at birth ...