Final answer:
Elderly individuals are at the highest risk for injury-causing falls due to factors like reduced muscle strength and balance issues.
Step-by-step explanation:
The age group at the highest risk for injury-causing falls is the elderly. As people age, they become more susceptible to falls due to factors such as reduced muscle strength, balance issues, and age-related changes in vision and reaction time. According to the Centers for Disease Control and Prevention (CDC), falls are the leading cause of injury among older adults and are responsible for the highest number of fatal and non-fatal injuries.