Why are the requirements for serving in the senate stricter than those that serve in
the house of representatives?

The requirements for serving in the senate are stricter because they must be at least 30 years old, have been U.S. citizens for 9 years, and live in the state they represent. The house of representatives must be at least 25 years old, live in the state where they were elected and have been U.S. citizens for 7 years. These differences are put in place because each senator has to be more active within the house since there are less people(100 people in senate to the 435 in house) which means each senator represents more people, which requires  them to be a better-qualified person.  The Senate is the upper house. It has much greater responsibilities. The Senate must confirm all Presidential nominations to the Supreme Court, the Cabinet, and ambassadors. The Senate must ratify all treaties and agreements the U.S. enters into with foreign nations.