The youngest starter ever was Jose Baxter who played for Everton when they faced West Brom at the start of the 2008/09 season. The young forward was only 16 years and 198 days old at the time. In fact, he had come on as a substitute a week earlier and almost helped Everton take all three points when his header from a Phil Jagielka cross was off target.
The second youngest player was Reece Oxford. When Reece Oxford made his Premier League debut for West Ham United against Arsenal on the opening weekend of the 2015/16 Premier League weekend, very few expected the 16-year-old to make a mark. He is only the second youngest player to make his EPL debut at 16 years and 236 days.