Gerontology or Geriatrics is the branch of medical science that deals with diseases and problems specific to mid-senior and senior citizens. More particularly, geriatrics is the study of health, wellness, and disease later in life including the health care of older persons and well being of their caregivers. Geriatrics is the biology of aging.
 
On the other hand, Gerontology examines the aging process in individuals from mid-life through old age. Gerontologists investigate the impact of the aging population on society, and are able to create and develop policies and programs as a result. Gerontology is the sociology of aging.  
What is Gerontology?
GRD