I'm not so sure.. I'm an introvert and a loner, so I often feel a bias against these kind of assertions. I want to be able to continue being a loner, feel good about it, exhibit resilience and self-reliance in a way that leaves me satisfied with my days, and invested in my intentions.

I don't have a lot of friends, but I have a few. I'm divorced, but I have a great kid and am still actively intertwined, familial-y speaking, with my ex-.

I wouldn't be able to say how all this affects my EOL quality and vitality, but I'm almost 50 and I don't feel diminished or negatively impacted by my life decisions or lifestyle yet.

I'm not "lonely" but I work to make sure I'm "alone" a good amount. I feel the urge to get social about once every 3 months and I can usually make it happen. I have a few places in the world where I travel, have friends, and can be super-social for a few weeks at a time.

If not determined by a lower bound, I wonder if they meant it qualitatively as we all quantitatively.