That sounds like a bad excuse for not getting his marketing right.
For one thing, if he believes that to be true he should be finding other channels to reach the demographic (and unless the house is a bungalow in a street where a lot of other older people live, the chances are he has that wrong, too).
For another, it is patently ridiculous to think that older people are not internet-savvy. I was using it at home in 1993 (I remember when we got our first PC, as my son was 2 and we got him a CD ROM with nursery rhymes that played when you moved the mouse?), and used it at work well before that, so it's not as though it is a new invention that older people have yet to discover. Also, I think that the majority of iPads are owned by older people who don't need the storage facilities of laptops.
I think your client should ask him for the basis of his point of view, as well as how his sales strategies have been tweaked to deal with it. If he is just advertising online, why is he being paid?