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The U.S. Constitution allows justices of the Supreme Court to serve until their death. They can also resign, retire or be impeached, or removed from office.

When a seat on the court opens, the president nominates someone to be a new justice. The U.S. Senate must confirm, or approve, the new justice.

Our current justices are listed in the order of how long they’ve served (with the exception of Chief Justice Roberts).

• Chief Justice John Roberts, 57, was born in Buffalo. He was appointed by President George W. Bush. Time in office: seven years.

• Justice Antonin Scalia, 76, was born in Trenton, N.J. President Ronald Reagan appointed him. Time in office: 26 years.

• Justice Anthony Kennedy, 76, was born in Sacramento, Calif. He was appointed by Reagan. Time in office: 24 years.

• Justice Clarence Thomas, 64, was born in Pin Point, Ga. He was appointed by President George H.W. Bush. Time in office: 21 years.

• Justice Ruth Bader Ginsburg, 79, was born in New York City. She was appointed by President Bill Clinton. Time in office: 19 years.

• Justice Stephen Breyer, 74, was born in San Francisco. He was appointed by Clinton. Time in office: 18 years.

• Justice Samuel Alito, 62, was born in Trenton, N.J. He was appointed by George W. Bush. Time in office: six years.

• Justice Sonia Sotomayor, 58, was born in New York City. She was appointed by President Obama. Time in office: three years.

• Justice Elena Kagan, 52, was born in New York City. She was appointed by Obama. Time in office: two years.