Prince Philip died of 'old age', death certificate reveals: Report

According to The Telegraph, Prince Philip's death certificate revealed that he died of 'old age'. Description of 'old age' suggests a disease or injury didn't contribute to his death. Notably, few weeks before his death, Windsor Castle's statement read the Duke underwent "treatment for an infection" and "a procedure for a pre-existing condition". He died on April 9, aged 99.