Former US president Joe Biden’s prostate cancer has spread to other parts of his body and is causing him pain, even as he continues to speak out on public issues, his son Hunter said in an interview. In a wide-ranging interview with the BBC broadcast late on Friday, Hunter Biden grew emotional as he discussed his father’s condition, describing it as very sad to watch. Joe Biden, 83, was the oldest man to serve as US president and his age was a source of concern for much of his four years in office. Hunter Biden listens while his father, US President Joe Biden, speaks during a Hanukkah reception at the White House in December 2024. Photo: APThe former president revealed his cancer diagnosis in May last year, less than four months after he left the White House.