Barnsley manager Danny Wilson says the on Saturday was "particularly satisfying" after he fielded such an inexperienced XI.
Three players made professional debuts, and three other starters are teenagers.
Barnsley's oldest player, Peter Ramage, was replaced in defence by George Williams after 28 minutes, a man who is yet to start a Football League game.
"With the lack of experience, lads making debuts, those coming from non-league, they did so well," said Wilson.
|Tykes team in transition|
|Relegated from second-tier with a starting XI that averaged 26-years-old.|
|Players that ended Saturday's win over Yeovil averaged 20-years-old.|
|This season, Barnsley have given Football League debuts to 14 players.|
"To get the result is particularly satisfying. Losing Peter was a blow but we put young Mason Holgate in the centre, George at full-back and it worked perfectly well."
Barnsley boss in management.
The 54-year-old led the Tykes to the Premier League in 1997 during his first spell at the club but could not prevent Championship relegation when he returned last season.
"It's one of the youngest teams I've ever put out," he told BBC Radio Sheffield.
"The beauty of missing experienced players is that the young lads were put in one of the most physical battles they'll have all season, came through and get a great boost of confidence."