The third-wicket CD partnership posted 122 as Young achieved the milestone of 3000 in the red-ball format when he reached 51.
CD resume today at 247-6 in a bid to reel in the Kings' 141 runs in the first dig.
"I had it in the back of my mind so to tick it off is quite pleasing and then to kick on to bring up my ton but, at the same time, there's still a lot of batting to come," said the 24-year-old who carved up his fourth century in the format, his second in as many rounds.
He said No 8 Adam Milne was capable and the tail enders were no mugs.
Young said he chose to bowl after winning the toss but the deceptively long-grassed wicket wasn't doing much.
"It did less than we thought it would for the seamers," he said, not expecting it to break up much either in the next two days.
Injured new-ball seamer Seth Rance didn't start. Neither Ajaz Patel nor Todd Astle or Tim Johnston got much as spinners.