Yeah. Vinnie joined B&R same time as Nick and pledged DIKs with him same time as him just after Rusty and Tommy had created the frat. Sage, Tybalt and Chad were already presidents of HOTs, Preps and Alphas so were likely at least second year students at the time, but if it was only a year ago they might have been starting their third year. We don't see Quinn in the flashback that gives this information so she's either the same age as Vinnie, Nick, Rusty and Tommy and joined that year or she is a year older than them (we don't get told what year the guys are in, only reference is that Sage is now in her final year).