What role have demographics and health care statistics played in healthcare?

Demographics and health care statistics can show what illnesses are most likely to befall certain members of the population. For example, both heart disease and cancer are probably shown by statistics to be more common in the aging part of the population ie nowadays amongst the baby boomers. 

No matter what they say you can’t change who you are so when u tell them whatever they say jus be like i’m who i am and i won’t change

Stimulants speed up the central nervous system.