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.

An axis is an imaginary line at right angles to the plane, about which the body rotates or spins. Plane – sagittal, as there is flexion and extension of the knees, elbows, neck and spine.

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.