The age at which half of the individuals who are born in a particular year will have died is called maximum longevity average longevity intrinsic longevity extrinsic longevity

I believe the answer is: Average longevity

Average longeivity is usually used by health organizaitons to evaluate the lifestyle, dietary choice, and violent level in a country.

Currenyly, United states have the average longevity of 70.5 years which is considerably lower compared to other developed nations (we are at rank 31th)