Nothing too fancy here. Just a look at the Rays 59-man Spring Training roster and how it breaks down by age. Players in blue are on the 40-man roster and players in white are non-roster spring training invites.
The average age of the spring roster is 27.7 which is down just a tad from the 2011 spring rosters (27.8). Considering the average big leaguer peaks around age 28, this seems to be optimal. Of the players in camp, 47 are in their 20s and 12 are in their 30s. The oldest is Jose Molina (36). And the youngest is Hak-Ju Lee (21), who is one of three players born in the 90s. Yes, the 90s.