Table 1. Focal subject age categorization guidelines.

Average height measurements calculated as the average height of American males and females in that designated age group according to the 2016 CDC Anthropometric Reference (Fryar et al., 2016).

Child	Estimated age 3–12 years; immature facial features, short stature, and commonly accompanied by older persons
Teenager	Estimated age 13–18 years; average height 1.67 meters; older school-aged individuals, often carrying backpacks
Adult	Estimated age 19–59 years
Older adult	Estimated age 60+; characterized by greying hair, developed wrinkles, and/or stooped posture