As the Walkman generation was succeeded by the mp3 and Ipod generations, and an increasing number of us walked around with plugs in our lugs, I became convinced that we were likely to see and increasing number of not-terribly-elderly with hearing difficulties. Young people just don't like turning it down.
At that point it also became apparent that hearing-aid manufacturers were likely to benefit. But who makes hearing aids ?
This blog gives some investment suggestions. I know nowt about the blog or the companies they suggest (except Siemens), so caveat emptor.
(inspired by this Clive Davis post)