The Indianapolis Star (Jeff Rabjohns) reports: Memphis has eight players 23 or younger and is one of only four teams in the league with at least four rookies. The Grizzlies’ starting lineup in 15 games — Mike Conley (21), O.J. Mayo (21), Rudy Gay (22), Darrell Arthur (20) and Marc Gasol (23) — averages 21.4 years old. Last year’s University of Memphis team that was the NCAA runner-up had a starting lineup that averaged 21.6 years old. “After you’ve been through a year, you understand the wear and tear, the grind and the level you have to play at, night in and night out,” Conley said. “It’s something I’ve gotten used to. “It’s a matter of putting all the things you’ve worked on every day in the offseason into games. You definitely have more responsibility as a second-year player.”