That forced the game to open up and Palace made good use of the additional space, a clipped cross from Umeh finding its way to Umeh at the back post; the Irishman tried to get a shot away but was denied by a robust challenge from Emmanuel van der Blaak, prompting unsuccessful penalty appeals.
That prompted the end of Umeh’s match as the Eagles brought on defensive reinforcements in the shape of Vonnte Williams – and the full-back was soon involved in throwing his body in front of a number of efforts from distance.
As the game ticked into its final quarter-of-an-hour, the PSV pressure grew, and the Eagles were once again indebted to the woodwork when Nassoh’s shot from the edge of the box deflected over Whitworth and struck the frame of the goal.
Bouncing back out to substitute Julian Kwaaitaal, the Dutch forward blazed over a volleyed rebound with the goal at his mercy.
PSV went increasingly physical and direct in their late siege on the Palace box, but the Eagles were breaking at pace and could have sealed the game with seven minutes remaining.
Roshaun Mathurin darted down the right and pulled the ball back for Devenny inside the area, but his side-footed shot whistled wide with the midfielder under pressure from an onrushing defender.
With Palace continuing to carve out shooting opportunities, Rak-Sakyi curled wide – but there would be one last final aerial siege on the Eagles’ goal in the four minutes of added time.
But despite Uneken appearing to miscue a header when well-placed, and Jevon Simons flicking one delivery into Whitworth’s palms, the home team by and large navigated the additional time with a degree of comfort.
When the full-time whistle sounded, deserved scenes of jubilation as the Young Eagles delighted in the triumph of a trophy lift at Selhurst Park – and the knowledge that, wherever their careers might end up taking them, this was a night they would remember for the rest of their lives.
Palace: Whitworth (GK), Imray, Jemide, Farquhar, Rodney, Umeh (Williams, 76), Ozoh, Devenny, Mathurin, Ola-Adebomi (Reid, 68), Rak-Sakyi.
Subs: Izquierdo (GK), Grante, Trialist, Akinwale, Agbinone.
Jong PSV: Schiks (GK), van de Blaak, Jansen, Egan-Riley, Dams, Jiménez, Abed (Kwaaitaal, 57), Nassoh, Uneken, Bars (Thomas, 86), Simons.
Subs: Kuhl (GK), Smolenaars, Geerts, de Guzman, Rovers.