Rock and roll will never die, but it will get older. Fresh from the silver screen comes that troupe of silverhaired crooners, the Young at Heart Chorus, voices a little grizzled, but none the worse for wear. Expect choral interpretations of musicians who defined your youth — Lou Reed, the Ramones, OutKast, and Sonic Youth among them — tonight at the Somerville Theatre (55 Davis Square, Somerville, 617.625.5700). The show is at 8 p.m. and doors open at 7; for tickets ($31), visit the box office or call 617.931.2000.
