I think what the feds are trying to say is that Trucchio (who was listed as an acting capo, or an official capo already around 2005) was around 28 at the time.
I don´t know exactly Trucchio´s date of birth but he might have been slightly younger than anybody who has ever been elevated to a captains rank in the past, including Cesare Bonventre in 1979. But this presupposes that he was an official captain, and not on acting basis only.