Nothing too fancy here. Just a look at the Rays 62-man Spring Training roster and how it breaks down by age. Players in grey are spring training invites that are not on the 40-man roster.
The average age of the spring roster is 27.8. Considering the average big leaguer peaks around age 28, this seems to be optimal. Eleven players are 28 and ten are 27. Of the players in camp, 47 are in their 20s and 15 are in their 30s. The oldest is Manny Ramirez (39) and the youngest is Tim Beckham (21).