How can we observe whether a person is a programmer?

First of all, we all know that programmers are a very hard job, because they often have to stay up late, and sitting in front of the computer all day has a great influence on their health. Over time, they will find themselves losing their hair. As a programmer in our county, you will find that the hairline of programmers is generally high. This is caused by their irregular living habits. Therefore, when we see a young man with little hair, then he must be a programmer.