Economics is a study of man in the ordinary business of life. It enquires how he gets his income and how he uses it. Thus, it is on the one side, the study of wealth and on the other and more important side, a part of the study of man.
In developed countries, an increase in the average age of the gravida has been documented. The mean age of primiparous women in Austria rose from 25 years in 1991 to 28 years in 2008. In Germany in 2006, most gravidas were between the ages of 30 and 34 years whereas in the 1970s, most babies were born to women aged 20â24 years.
Muscle weighs more than fat, so a muscular person may appear to have a higher BMI, or a frail, inactive person may have more body fat than is healthy. For adults 20 years and older: 1  A BMI below 18.5 (shown in white) is considered underweight. 2  A BMI of 18.5 to 24.9 (green) is considered healthy. 3  A BMI of 25 to 29.9 (yellow) is considered overweight. 4  A BMI of 30 or higher (red) is considered obese.