What are the most useful bones for determining biological sex, and age of a skeleton? Answer each one individually, they are not necessarily the same bones.

(Forensics)

The human pelvis Is use for determining sex of skeletal remains. The woman pelvis provide optimal space for birth canal which is shown in the morphology and relationship of it's different part. Skull is also use.

The fourth ribs is use for determining the age of skeletal remains.

Explanation:

The human pelvis is use to determine the biological sex of skeletal remains. The woman pelvis is wider than man's and it provide space for birth canal.

The fourth ribs is use to estimate the age of skeletal remains as the cartilage between the ribs and sternum gradually turn as time goes on. The features of the head can also be use to estimate the age of skeletal remains.

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.