Nearly 20 years ago, Brian “Dexter” Holland (vocals, guitar and piano) and Greg Kriesel (bass) were high school classmates and cross-country teammates in Orange County, Calif., with an interest in metal-infused punk rock. They began making music together and eventually started adding other pieces, like Kevin “Noodles” Wasserman (guitar and vocals), allegedly because he was old enough to buy beer, and three drummers before Pete Parada joined in 2007. Of course, by then, the Offspring had blazed a punk trail for bands like Green Day, Rancid and Sublime. The Offspring first gained mainstream attention with one of the seminal punk album of the mid-’90s, the multiplatinum Smash. And the four-piece has worked steadily ever since—gaining more fame for “Pretty Fly (For a White Guy)”—becoming one of the top-selling punk bands of all time. Their most recent work, Days Go By, came out earlier this summer, and you can see them, with Neon Trees and Dead Sara, tonight at Terminal 5.