What are all the qualifications of members of Congress?

Answer 1

Required... none really.

Even age isn't a factor. The House of Representatives being the most lenient. The Senate is a bit more scrutiny.

Under the Constitution, the Senate (not the courts) is empowered to judge if an individual is qualified to serve. During its early years, however, the Senate did not closely scrutinize the qualifications of members. As a result, three individuals that were constitutionally disqualified due to age were admitted to the Senate: twenty-nine-year-old Henry Clay (1806), and twenty-eight-year-olds Armistead Mason (1816) and John Eaton (1818). Such an occurrence, however, has not been repeated since. In 1934, Rush Holt was elected to the Senate at the age of twenty-nine; he waited until he turned thirty to take the oath of office. Likewise, Joseph Biden was elected to the Senate shortly before his 30th birthday in 1972; he had passed his 30th birthday by the time the Senate conducted its swearing-in ceremony for that year's electees in January, 1973.

Answer 2

You have to be an American citizen; at least 25 years old and a citizen for 7 years for the House, or 30 and a citizen for 9 years for the Senate; and a resident of the state you plan to represent. That's about it.

Answer 3

As defined in Article I of the Constitution.

Read sections 2 through 6.