Some NFL Drafts are billed as the “Year of the Quarterback,” but this is not one of them. Trumpeting what goes down Thursday night as the “Year of the Offensive Tackle” is not exactly riveting, but that’s the way it’s shaping up. Expectations are three of the first five selections in the opening round will be offensive linemen, and there certainly is a chance the Giants later on will join in on the trend. Their history — and the history of general manager Jerry Reese — suggests bolstering the offensive line with a first-round pick is not the way the Giants will go, but that could change with D.J. Fluker looming as a possible and massive addition. Since 1990, the Giants saw fit to take an offensive lineman in the first round only once, in 1999, when they made Luke Petitgout of Notre Dame their new left tackle. Reese took over as GM in 2007 and in his six drafts, the highest he has selected an offensive lineman is the second round in 2009, when he chose Will Beatty. Mostly, the Giants have relied on veterans from other teams (Kareem McKenzie, Shaun O’Hara, David Baas) to fill out their offensive line, desirous of having a seasoned group in front of Eli Manning. Age is creeping into the group, though. Baas, 31, is coming off multiple surgeries this offseason. Chris Snee, 31, is coming off hip surgery. David Diehl, 32, is coming off knee surgery and is the longest-tenured Giants player, arriving in 2003 — a year before Snee and Manning. Diehl remains on the roster after accepting a hefty pay cut. Entering his 11th season, Diehl is a proud vet eager to re-establish himself, but there’s a need for a long-term answer at right tackle, which Fluker is projected to be.