Two synonymous sentences are converted and answered quickly. The question is as follows. By the way, what is the reason for this answer? Thank you! ~

1. If you look closely, you will find that they are different.

→

Look carefully, and you can find the difference between them.

Look carefully => Pay attention = Look carefully => Look carefully.

Find out their differences => Find out their differences.

He became an actor when he was eight years old.

→

He became an actor when he was eight years old.

At age+numbers express "at xx years old"

example

Usually a child goes to primary school at the age of 6.

In the United States, young citizens will have the opportunity to vote for the first time when they are 18 years old.