There are just four players selected who featured in last season's campaign - Ulster duo Jacob Stockdale and Adam McBurney, Leinster's Andrew Porter and Conan O'Donnell of Connacht.
Meanwhile it is Leinster lock James Ryan who will skipper the side, and having already worked with the players at a number of training camps, Carolan is excited by their potential.
"While we have just the four players returning from last season, we have been really impressed with the attitude and enthusiasm that the new guys have brought with them into the squad," explained Carolan.
"We've had a number of camps with this group of players, as well as two warm-up games against Leinster and Munster before Christmas, so now we are just looking forward to getting the championship started against Wales."
Ireland kick off their campaign at home to Wales on February 5th at Donnybrook before travelling to France in round two.
Ireland Under-20 Squad for the Under-20 Six Nations Championship
James Bollard (Dublin University / Leinster)
Kelvin Browne (Shannon / Munster)
Peter Claffey (Galwegians / Connacht)
Will Connors (UCD / Leinster)
Max Deegan (Lansdowne / Leinster)
Shane Fenton (Young Munster / Munster)
John Foley (Shannon / Munster)
Cillian Gallagher (Sligo RFC / Connacht)
Greg Jones (UCD / Leinster)
Conor Kenny (Buccaneers / Connacht)
Adam McBurney (Ballymena / Ulster)
Sean O'Connor (Cashel / Munster)
Conan O'Donnell (Sligo / Connacht)
Andrew Porter (UCD / Leinster)
James Ryan (Lansdowne / Leinster)
Dan Walsh (Cork Con / Munster)
Matthew Byrne (Terenure / Leinster)
Brett Connon (Newcastle Falcons / Exlies)
Shane Daly (Cork Con / Munster)
Hugo Keenan (UCD / Leinster)
Terry Kennedy (St. Mary's / Leinster)
Stephen Kerins (Sligo / Connacht)
Paul Kiernan (UCC / Munster)
Robert Lyttle (Queen's University / Ulster)
Johnny McPhillips (Queen's University / Ulster)
Conor O'Brien (Clontarf / Leinster)
Jimmy O'Brien (UCD / Leinster)
John Poland (Cork Con / Munster)
Jack Power (UCD / Leinster)
Jacob Stockdale (Belfast Harlequins / Ulster)
Click here for the 2016 RBS 6 Nations schedule
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