Young uses his feet and makes room as he slaps Prasidh past point for a four to raise his fifty from 68 balls.
New Zealand will look for boundaries regularly to stay in touch with the asking rate.
Kuldeep has struggled to control the flow of runs. He drops it well short as Mitchell easily rocks back to cut it for a boundary before taking one.
Kuldeep pitches it up and gets some turn as Young gets the outside edge but short of the fielder at short thirdman before he takes one on the leg side.
Two more singles as Kuldeep goes for seven runs in his fifth over, for expensive figures of 41 from five overs at more than eight per over.
India search for a breakthrough as they bring back Rana. Mitchell in complete as he plays a confident pull shot off the pacer for a boundary through midwicket.
He picks a single on the leg side to bring up the 100-run stand for the third wicket from 102 balls.
Young walks across his stumps to clip Rana to deep square leg for a couple of runs before he hits the next ball straight back at the non-striker to miss out on a possible four and get just one.
New Zealand are 149/2 in 30 overs, needing another 136 runs from 20 overs for victory at 6.8 per over.
Mitchell has been instrumental in New Zealand's recovery, stroking 63 from 61 balls with five fours, while Young has been solid on 55 from 74 balls.