The oldest player at the 1975 Cricket World Cup was Don Pringle (41) of East Africa while the youngest player was  Javed Miandad (17/18) of Pakistan.
At the 1975 Cricket World Cup, the most experienced player was Don Pringle from East Africa, who had been playing for a long time, whereas the youngest player was Javed Miandad from Pakistan, who was still developing his skills.