For the small cost in time (if you do your own) and expence (can't be more than a few hundred quid), a basic website is a small investment for possibly a large return.
I know I never bother looking through telephone books these days; I use google. Maybe the elderly don't use the interweb, so I advertise in a Parish Mag which has brought in a good few wealthy middle class Christian types - good customers on the whole and £25 a year advertising in them is spot on.
It's cheap and lazy marketing, but it does work over time.