Title: United States House of Representatives
Content:  Article I, Section 2 of the Constitution sets three qualifications for representatives. Each representative must: (1) be at least twenty-five years old; (2) have been a citizen of the United States for the past seven years; and (3) be (at the time of the election) an inhabitant of the state they represent. Members are not required to live in the districts they represent, but they traditionally do. The age and citizenship qualifications for representatives are less than those for senators. The constitutional requirements of Article I, Section 2 for election to Congress are the maximum requirements that can be imposed on a candidate. Therefore, Article I, Section 5, which permits each House 
Title: Age of candidacy
Content:  In the United States, a person must be aged 35 or over to serve as president. To be a Senator, a person must be aged 30 or over. To be a Representative, a person must be aged 25 or older. This is specified in the U.S. Constitution. Most states in the U.S. also have age requirements for the offices of Governor, State Senator, and State Representative. Some states have a minimum age requirement to hold any elected office (usually 21 or 18).
Title: Article One of the United States Constitution
Content:  "No Person shall be a Representative who shall not have attained to the Age of twenty five Years, and been seven Years a Citizen of the United States, and who shall, when elected, be an Inhabitant of that State in which he shall be chosen." The Constitution provides three requirements for Representatives: A Representative must be at least 25 years old, must be an inhabitant of the state in which he or she is elected, and must have been a citizen of the United States for the previous seven years. There is no requirement that a Representative reside within the district in which he or she represents; although this is usually the case, there have been occasional exceptions. The Supreme Court has interpreted the Qualifications Clause as 
Title: List of youngest members of the United States Congress
Content:  The following are historical lists of the youngest members of the United States Congress, in both the House of Representatives and the Senate. These members would be the equivalent to the "Baby of the House" in the parliaments of Commonwealth countries; the U.S. Congress does not confer a similar title upon its youngest members. The youngest U.S. congressman tends to be older than the youngest MPs in Commonwealth countries. This is partly because the minimum age requirements enumerated in Article One of the United States Constitution bar persons under the age of 25 years and 30 years from serving in the House and Senate, respectively. Additionally, 
Title: List of United States representatives from Virginia
Content:  Article I of the United States Constitution mandates the minimum age for a Representative to be 25 years old.
Title: United States House of Representatives
Content:  be the judge of the qualifications of its own members does not permit either House to establish additional qualifications. Likewise a State could not establish additional qualifications. William C. C. Claiborne served in the House below the minimum age of 25. Disqualification: under the Fourteenth Amendment, a federal or state officer who takes the requisite oath to support the Constitution, but later engages in rebellion or aids the enemies of the United States, is disqualified from becoming a representative. This post–Civil War provision was intended to prevent those who sided with the Confederacy from serving. However, disqualified individuals may serve if they gain the consent of two-thirds of both houses of Congress.
Title: Age of candidacy
Content:  In Australia a person must be aged 18 or over to stand for election to public office at federal, state or local government level. The youngest ever member of the House of Representatives was 20-year-old Wyatt Roy elected in the 2010 federal election after the Electoral Act 1918 was amended (in 1973) to reduce the age of candidacy for that office from 21 to 18.
Title: Baby of the House
Content:  In the Congress of the Philippines, the term "Baby of the House" is rarely used; the term "Benjamin" of the chamber is used instead. Special treatment is not given to the youngest member of either chamber. However, by tradition, the youngest member of the chamber usually administers the oath of office to their incoming leader (i.e. President of the Senate and Speaker of the House of Representatives). The minimum age for being a member of the House of Representatives is 25 years old, while for the Senate, it is 35, as stipulated in the 1987 Constitution of the Philippines. In 1933, Benigno Aquino, Sr. became senator at the age of 33; the Jones Law, which created the Senate, had prescribed the minimum age of 30. The current Benjamin of the House is Representative Braeden John Biron of the 4th District of Iloilo. Meanwhile, Senator Manny Pacquiao has been the youngest Senator since 2016.
Title: House of Representatives of the Philippines
Content: No person shall be a Representative unless he is a natural-born citizen of the Philippines, and on the day of the election, is at least 25 years of age, able to read and write, a registered voter except for a party-list representative, and a resident of the country for not less than one year immediately preceding the day of the election. ; The age is fixed at 25 and must be possessed on the day of the elections, that is, when the polls are opened and the votes cast, and not on the day of the proclamation of the winners by 
Title: U.S. Term Limits, Inc. v. Thornton
Content:  Person shall be a Representative who shall not have attained to the Age of twenty-five Years, and been seven Years a Citizen of the United States, and who shall not, when elected, be an Inhabitant of that State in which he shall be chosen (Article I, section 2)," and: "No Person shall be a Senator who shall not have attained to the Age of thirty Years, and been nine Years a Citizen of the United States, and who shall not, when elected, be an Inhabitant of that State for which he shall be chosen (Article I, section 3)." Also critical to the issue is 

Question: under article 1 what is the minimum age required to serve in the house of representatives?
Answer: 25.
25 years old.