"I'm 74 years young," Buddy Guy announces over dusty acoustic guitar in Living Proof's opener. He sounds like an ancient Mississippi bluesman — that is, until the screaming, Chicago-style electric lead kicks in, obliterating the sepia-tone ambience. Guy's latest is a musical memoir in which he finds gratitude in "Stay Around a Little Longer" (a soulful duet with fellow aging blues vet B.B. King) and peace in his mortality in the gospel blues of "Everybody's Got to Go." From the Stratocaster sizzle of "Key Don't Fit" to the piercing Telecaster sting of the title track, it's the best batch of blues Guy's cooked up in years.