Of the 11 youngest NBA players, 4 of them are Rockets. The Rockets rookies are young rookies. Considering that Paolo isn't much younger (6 months) and Ivey is older, than Chet, Smith is the only one that has a real age advantage over Chet that has a reasonable chance of being drafted before Chet.
He’s still a teenager lol. His body won’t even be fully developed until his mid twenties. Him being 19 instead of 18 is literally irrelevant to his NBA career. Btw Mobley is a year older than our rookies as well and was also the age of a sophomore when he got drafted.