Two of Dr Brown's Patients Are in Identical Health, Both Having Heart

Multiple Choice

Two of Dr. Brown's patients are in identical health, both having heart disease, diabetes, and limited physical abilities. However, one of these patients is 86 years old and the other is 56 years old. This example best points out what is meant by the term:

A) social age
B) chronological age
C) psychological age
D) biological age