But Ridenton is only 17 and can't legally buy his first beer until March, while Boyd is 18 and will celebrate his 19th birthday on December 30.
Their elevation in to the squad is a clear ploy by Merrick to give his side some punch from the pine, while veteran Paul Ifill will also likely start the game on the bench given his best work this season has been as an impact player.
There were slight injury concerns around midfielders Carlos Hernandez and Albert Riera but both have come through the week well.
Merrick said at the beginning of the season he wanted eight or nine games to assess how the team would shape up and following nine games they've lost five and drawn four.
Despite the dire results and the fact they sit just above last place on the A-League ladder, Merrick wasn't bothered.
"Panicking? That's not a word in my vocabulary,'' the Scotsman said. "It's a continual work in progress. We are creating chances, we've got to score them. I understand that we have got to make the finals and it's tough to make the finals if you lose points and don't pick up the full three points but there's still 54 points to play for. But I'm pretty keen to get a win, but not just one win, several wins.''
Central Coast, traditionally one of the league's most consistent sides, were soundly beaten 4-0 by Adelaide United last week and haven't hit their stride this summer.
They've only mustered nine goals from as many games and sit in sixth on the points table as they come to terms with a coaching change after Graham Arnold announced his departure last month with former assistant Phil Moss taking over.
Tomorrow's game marks the first A-League fixture to be played at North Sydney Oval.