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It's interesting how skull thickness can vary based on factors like age, sex, and race, according to the National Institute of Health. It appears that there is a significant increase during the first two decades of life followed by a slower uniform increase until peaking in the fifth and sixth decades. The variations between males and females are also noticeable, with certain age groups showing female skulls being thicker than their male counterparts.

Additionally, there are differences observed between races as well. For example, the frontal bone is found to be thicker in white males compared to black males. On the other hand, parietooccipital bones are thicker in blacks compared to whites. The specific reasons behind these variations have been discussed and may offer insight into understanding the anatomy and biology of skulls across different demographics.