Diminishing time with family and children is replaced with more time alone
I agree that flexing the boredom muscle is good, as is finding joy in time to yourself.
But don't know if embracing solitude is the right conclusion to draw from a chart of alone time increasing over lifespan.
That you could also flex the socialising muscle, and try to buck a trend from a chart of averages.
I am already off the chart on average hours per day, so there is also that..