You are at the residence of an alert and oriented 87-year-old female patient who is very short of breath but is refusing to go to the hospital. Instead, she wants you to treat her at home and then leave when she feels better. As an EMT knowledgeable of the characteristics and behaviors of this age group, you would become suspicious that her request is based on the fact that she:

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