The Seattle rock band Chastity Belt has always been goofy, self-mocking, and, on occasion, vulgar. But their latest, “Different Now,” reveals a vulnerable self-awareness that was buried in their previous two albums. A wistful guitar line sets the tone while they confront aging and solitude. “Take away your pride and take away your grief/And you’ll finally be right where you need to be,” sings guitarist Julia Shapiro. “It’s different now you’re old.” Aging isn't graceful, nor is it easy, but the four-piece follow a pace of forward motion despite sounding defeated. They’ve opted for a mellow post-punk sound that flushes their slacker indie rock with layers of depth. They end the song, singing in chorus, “And you try and you try,” repeatedly, accepting that there is only so much you can do to control life passing you by.