As Blake Shelton’s nostalgic new single, “I Lived It,” continues to climb the charts—currently No. 13 on Billboard’s Country Airplay chart after 10 weeks—the Oklahoma native says part of the song’s allure is its old-school aura. The new tune, which was penned by Rhett Akins, Ashley Gorley, Ben Hayslip and Ross Copperman, features lyrics like…