MICHAEL BELLUSCI’S quotation in his high school yearbook was, “It ain’t rock if it ain’t loud.” Growing up in Flushing, Queens, he played guitar and drums, idolized Jimi Hendrix and performed in cover bands. Later, he went on the road as Ringo in the musical “Beatlemania.”

These days, if his left ear happens to be covered by a pillow, Mr. Bellusci, 47, hears the alarm clock as a faint tick, tick, tick, not a blaring BEEP, BEEP, BEEP. In cacophonous restaurants, he watches people’s mouths so he can follow the conversation.

Years of high decibel noise and trauma from speaker feedback damaged his right ear. Mr. Bellusci, who plays ukulele, recorder, guitar and bass in an acoustic duo, now says, “If I could do it over again ...”

How many boomers are thinking the same thing.

As more members of the generation born after World War II enter their 60s, and the effects of age conspire with years of hearing abuse, a number find themselves jacking up the volume on their televisions, cringing at boisterous parties and shouting “What?” into their cellphones.