A 16-year-old male was killed after driving at excessive speeds and then losing control of his car. He was not wearing a seat belt. In an attempt to understand why such a tragedy would occur, you would recognize that:

Lifespan development is the study of how people change and grow from conception to death. It involves three developmental domains: physical, cognitive, and psychosocial. 

Lifespan development includes five stages:
Infancy: From birth to one year old
Toddlerhood: From one to five years old
Childhood: From three to 11 years old
Adolescence: From 12 to 18 years old
Adulthood: After adolescence