Answer: His temperament will be very similar to what it was 40 years ago.
Step-by-step explanation:
It can be defined as temperament to the character of a person, which affects their mood or motivation. Several studies have shown that temperament has a biological and a genetic component, and is usually consistent over time. So in this example, researchers are very likely to discover that the temperament of man is very similar 40 years ago.
I hope this information can help you.