As you grow older, spending quality time with people also requires spending $. If you are barely making some savings, you probably won't feel comfortable in scaling up your social life.
It is surprising that the author recognizes the time period/age group...
> These new habits are startling — and a striking departure from the past. Just a decade ago, the average American spent roughly the same amount of time with friends as Americans in the 1960s or 1970s.
...but cannot (does not dare to?) make the correlation that financial insecurity has exploded.