For me it generally means being in a somewhat stable state, generally content with where you are and where you are likely to go.

Stability. Stable housing, stable employment, stable relationships, stable emotions, and enough money saved that I'm not fucked if anything turns out unstable. Having been unstable in all these ways when I was younger that stability is something I've been willing to sacrifice for.

“Having your life together” is the state you’re supposed to be in after the “when I grow up”-phase is completed, a phase in which you are expected to master the art of “adulting”.

You always know what to do, never clueless and of course well prepared for whatever life throws your way.

So basically a lot of bullshit, something people tell you to achieve because they are tired of hearing about your struggles.

I can afford my life without relying on anyone. I’ve accomplished the major milestones I wanted (homeownership, postgraduate degree). Now that goalpost has moved to maintaining the enclosure and adding skills. Basically always be proactive. Even if it’s little things.

Being relatively independent. At least enough to fulfill my reasonable desires.

It means you're NOT looking forward to the collapse of society.

Nothing. We're all trying our best.