They have been rewarded with a prime Ravenhill semi-final against New Zealand and Wales Coach Jenkins said, "Everyone in the national team management is delighted with the success of the U19 squad.
"The players and coaches have done Wales proud and everyone here will be right behind the team tomorrow night. We will be encouraging them to go out and attack New Zealand from the outset.
"It is a fantastic achievement to reach the semis - it demonstrates just how much quality work is being done within the academy system in Wales at the moment.
"But it's not over yet. We know from the Pool matches that New Zealand are a very strong side but this is a one-off game and anything is possible - it's a case of keeping up the momentum and not giving up. At times like these you've got to have strong belief in yourselves and give it everything you've got and I'm sure the coaches and players will be doing just that.
"Wales have obviously grown as a team during this tournament and through the experience of the last three matches will be better prepared and more competitive for this game than they were when they came up against New Zealand on Day One of the event."
Wales have made two changes for this match after Friday's 29-0 victory over Argentina. Llantrisant and Blues prop Patrick Palmer has had to return home with ankle ligament damage and has been replaced in the squad by Pontypridd's Sam Hobbs who will take up a place on the bench tomorrow.
The other change sees scrum half Gareth Williams in the starting line-up in place of Bridgend's Rhys Webb.
Head coach Justin Burnell said, "We came here with the aim of achieving a top four finish. We can be pleased that we have done that, and be excited about our next two games in the championship.
"If we are to improve and move forward as a nation, we have to get out of our comfort zone and play regularly against the best sides in the world - the Southern Hemisphere sides. We have already played New Zealand, Samoa and Argentina in Pool matches, now we have New Zealand again - then either Australia or South Africa on Saturday, either in the final or the third/fourth place play-off.
"I am thrilled for this group of players and management. They are an extremely honest bunch and they are unsung heroes of Welsh rugby in a way. For many of them, this is the first taste of international rugby and they have all worked hard and just got on with whatever has been put in front of them."
IRB U19 World Championships Semi-final - Tuesday April 17th, Ravenhill, kick-off 7.30pm (available to television viewers on BBC2 interactive via the red button or BBC Northern Ireland digital channel)
Wales U19 team v New Zealand:
Daniel Evans (Llanelli / Scarlets)
Jimmy Norris (Bedwas / Dragons)
Luke Ford (Wanderers / Blues)
Rhys Williams (UWIC / Scarlets)
Leigh Halfpenny (Neath / Ospreys)
Gareth Owen (Maesteg / Ospreys)
Gareth Williams (Wanderers / Blues)
Ryan Bevington (Bridgend / Ospreys)
Huw Dowden (Beddau / Blues)
Lloyd Elliott (Ospreys)
Haydn Pugh (Llangennech / Scarlets)
Josh Turnbull (Llanelli / Scarlets)
Jevon Groves (Cardiff /Blues)
Nicholas Cudd (Tumble / Scarlets)
Sam Warburton (Capt, Wanderers / Blues)
Ben Roberts (Ebbw Vale / Dragons)
Sam Hobbs (Pontypridd /Blues)
Phillip Price (Bridgend Athletic / Ospreys)
Nathan White (Bridgend / Ospreys)
Lloyd Phillips (Narberth / Scarlets)
Jonathan Griffiths (Glynneath / Ospreys)
Rhys Webb (Bridgend / Ospreys)
David Langdon (Ebbw Vale / Dragons)
Tom Williams (Bridgend / Ospreys)
Nicholas Harwood (Bonymaen / Ospreys)
James Egan (Cardiff / Blues)