Hmmm. I just looked through it and, yes, it appears to be a roommate matching service, irrespective of age.

But looks like it is aimed at helping folks age in place: "If you can't swing a forever home and you still want to stay where you are, you may need an alternative source of income. And an increasingly popular one…is home sharing. Silvernest, a home-sharing service for older homeowners that matches them with roommates..."

When I first heard about it, I remember being told the focus was on young/old matches, but maybe they pivoted or I misremember.