During the commercial heyday of Tijuana Brass's record sales, most of those record buyers were not Baby Boomers, and instead that older-adult demographic, right?
There is no doubt, however, that the boomers (particularly in the U.S. of A.) were the major record-buying demographic in the decade of the 1970s.
During the TJB heyday, Boomers bought most of the singles, while adults bought most of the albums. The TJB was important because it blurred some of those lines---adults who liked a TJB song might buy the single if they weren't sure about the album---and more Boomers bought TJB albums than pretty much any other adult-appealing act.