Which sentence states a fact?
Serena Williams was too young when she started playing tennis. Serena Williams began playing tennis when she was four years old.
A fact is something that can be proved to be true. Facts can be proved by observing, measuring, or studying information.
The flag of the United States has 13 stripes.
This is a fact. It can be proved by looking at the flag and counting the number of stripes.
An opinion is something that a person believes, thinks, or feels. An opinion cannot be proved true.
The flag of the United States is easy to draw.
This is an opinion. People may have different opinions about what makes a flag "easy" to draw.
The second sentence states a fact.
Serena Williams began playing tennis when she was four years old.
It can be proved by reading a book or an article about Serena Williams.
The first sentence states an opinion.
Serena Williams was too young when she started playing tennis.
Too young shows what a person believes, thinks, or feels. Another person might have a different opinion about how young is too young.