We know that, for a variety of reasons, more and more people are living alone. As of 2018, single-person households represented about 28% of all households in the US. This is up from 13.1% in 1960.
Here in Canada, single-person households became the predominant household type in 2016 (we're also at 28%) for the first time in Canada's 150+ year history. And the numbers are even higher for some European countries. In Finland, Germany, and Norway, more than 4 in 10 households are single-person.
Part of this has to do with people living longer. In Canada, 42% of people aged 85 or older (and living in a private household) live alone. But part of this is also cultural. Japan has one of the oldest populations in the world, but it doesn't have the highest percentage of single-person households. Although, the number is relatively high and increasing. It's nearly 40%.
Whatever the case may be, you could argue that there appears to be some sort of global trend line toward more people living alone. But here's an important question: Is this a good thing?