Former US President George H.W. Bush, front centre, and past presidents and first ladies Laura Bush, from left, George W. Bush, Bill Clinton, Hillary Clinton, Barack Obama, Michelle Obama and current first lady Melania Trump in a group photo at the funeral service for former first lady Barbara Bush in April. Picture: Paul Morse/Courtesy of Office of George H.W. Bush via AP

Washington - Former US president George HW Bush died Friday at age 94, his office said.

His son, former president George W Bush said in a statement his father was "a man of the highest character and the best dad a son or daughter could ask for."

Bush had been in frail health for years, and his death follows that of his wife of 73 years, Barbara, who died in April.

Bush served as president from 1989 to 1993.

US President Ronald Reagan and his wife, Nancy, right, stand with Vice President George Bush and Barbara Bush following the oaths in the Capitol Building in Washington in 1985. Picture: Bob Daugherty/AP

Former presidents George W. Bush, left, and George H.W. Bush arrive at St. Martin's Episcopal Church in Houston for a funeral service for former first lady Barbara Bush in April. File picture: David J. Phillip.AP

Former US presidents George H.W. Bush and his son pose for a photo in Kennebunkport, Maine in June. File picture: Office of George W. Bush via AP

Then-first lady Barbara Bush, centre, laughs with Sen. Paul Simon, D-Ill, right, after receiving the pen President George Bush, left, used to sign the National Literacy Act of 1991 during a ceremony at the White House in Washington. File picture: Marcy Nighswander/AP

President-elect George H.W. Bush and his wife, Barbara, are shown during a morning beachfront news conference in Gulf Stream, Florida in 1998. File picture: Kathy Willens/AP