This is actually a great idea. They're used to the slower pace, are often available at reasonable rates, and aren't expecting 75MB files to populate an online portfolio with.
Originally Posted by BradS
The retirement home thought is really wonderful too. And in addition to what was said previously about it, I think that the older one is, the less likely they are to have a proper portrait taken. And so it could be a great thing for them to share with their families and friends as well, not to mention very quick word-of-mouth referrals!