This categories are used for statistics, in this way information about their health, wellbeing and other factors can be determined in a better form. As you can see, the old people are in a very broad age range so it is important to separate them to have more accurate information. The problems affecting a person that is 65 differ a lot from one who is 85.
According to the medical dictionary these are the categories:
-The young-old: between 65 and 74 years of age.
- The Middle-old: between 75 and 84 years of age.
-The Old-old: 85 years of age and older.
