Joshua O'Neal Jackson (born February 10, 1997) is an American basketball player for the Phoenix Suns of the National Basketball Association (NBA). He played college basketball for one season with the Kansas Jayhawks before declaring for the 2017 NBA draft, where he was selected fourth overall by the Phoenix Suns. Using only the above description and what you know about the world, "Joshua O'Neal Jackson was 21 when he was selected to play for the Phoenix Suns." is definitely correct, incorrect, or inconclusive? 