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.

It was opened up exactly on the suture lines/joins, preceded by a sword cut on the right parietal and occipital bones, and then scattered among animal skulls. The human skull had been cut up ...

One of the cranial sutures — the wiggly lines on a skull where the individual bones fuse during life — was already closed, which does not normally happen until a person is older than 65.

Diastatic skull fractures occur along the suture lines in the skull, which are the areas between the bones that fuse during childhood.

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.