At what age does the shape of a person's head stop changing? can it change in adulthood? someone just pointed out back of my head is higher than front

Yes.....: with PAGET's disease, a painful condition in which inflammation in the bone softens it, the shape changes. Especially skull. This is a reason for evaluation. It can cause weakened bones. It is VERY easily treated. Other causes of thin bones like lack of vitamin D, calcium, bone infection, bone tumor, abnormality of the hormones controlling mineral level are also possible and treatable.