This year I turned 32, and 三十而立 finally started to make sense.
The saying means you should be "standing up" by thirty. Asian parents love it as ammunition for marriage, kids, house, the works. What I've been feeling has nothing to do with any of that.
Standing on your principles
The first 立 is the stage where you have thoroughly internalized the principles, the code, the ethics that make you who you are. It's about what kind of person you want to be, and how you interact with the world.
I notice this in myself now. I no longer have to perform being myself. I don't deliberate over which version of me to bring into a room. Being myself is enough to carry me through almost any situation, and that is quietly liberating.
Standing on what you've learned
The second meaning is that learning has taken root.
At fifteen, Confucius 志于学. He aspired to learn. By thirty, that aspiration was no longer necessary, because the learning had consolidated. You don't need to aspire toward something you already stand on.
有以自立，则守之固而无所事志矣
This one hit me. Most of my twenties were spent reaching for something. Reading more, learning more, doing more, trying to fill some perceived gap. Now there's less reaching. Not because I know everything, but because the foundation is set. New things land on top of something solid, instead of being the thing I'm desperately trying to construct.
Standing as a consolidated self
The third meaning is 立身. A consolidated self.
This is the broadest reading. By thirty, your scattered experiences, your studies, your failures, your relationships all fuse into a coherent center. You know what you value. You know how you want to act. You can respond from that center, instead of constantly improvising or deferring to whoever happens to be in the room.
It's the difference between having opinions and having a person.
Not sure if any of this silly self-reflection makes sense to my younger self.
Looking back, it just feels great to be on the journey, and to realize every day and every year is the best year ever.