If your selling to seniors, go f2f. It's daytime work and these people are generally home. If they are not, just go back again. I promise you you"ll get them; they do live there.
I'm still doing f2f with seniors, but I'd like to start selling over the phone. It seems like a more efficient use of time. The older seniors don't use computers and are more comfortable with a hand shake f2f, but the younger ones are computer savvy, so it may be time to transition.