How old is the thesis age 65+- 15?
It means 50-80. In the paper, the average age of a group is usually expressed by the mean+-standard deviation, so the paper age of 65+- 15 means that the average population is 65+- 15, and the calculated result is 50-80. Standard deviation = [(sum of squares of each number minus sum of squares of each number/10) and then divide by 6].