Only leading up to the NBA draft can a 23-year-old be considered an old man.

Such is the life these days for NBA prospects who attended college for more than a couple years, players like former Michigan State forward Adreian Payne who was among the six players to work out for the Celtics on Wednesday.

Payne, a three-year starter for the Spartans, was among the top players in the country when coming out of high school in 2010.

Many of those guys are already in the NBA, including former No. 1 overall pick Kyrie Irving as well as a pair of current Celtics, Jared Sullinger and Phil Pressey.

Payne understands he's among a select number of college seniors expected to be drafted in the first round of the June 26 NBA draft.

To him, being a little older isn't as big a drawback or concern as some might make it out to be.

"I'm a little older than a couple of guys," admitted Payne. When it comes to getting on the court, age doesn't matter. You're out there to produce for your team and show what you can do. When it's time to get on the court, age isn't a factor."

Some of Payne's best moments have come in the biggest games of the season, something that's only enhanced over time and with experience.