This early 20s trend is looking pretty consistent. It applies to me too.
From what I recall of being a teenager, realising one's personality was quite an introspective and selfish experience, though perfectly natural obviously, and any changes seemed to come about merely as a result of one's hormones and emotion suddenly veering off in a different direction. People around me, and myself for that matter, seemed to be putting a lot of effort into making their personalities known, but being so immature and self-involved doesn't really make for substantial realisations of one's character.
To put it simply, and without having any researched psychological understanding of the process, it seems that once you hit 20 you really have to start making yourself useful to the world, and to me that stands out as on of the first substantial markers for change in one's personality - it's less self-involved (though may be just as self-conscious) and it has to adapt what is around it, ie. other people and new responsibilities. Generally there is less supporting you also, and so your choices and decisions stick and define you far more as an independent person in comparison to teenhood, where a lot of the significant things that take place regarding your personality are the consequence of being hormonal and bat-shit crazy (I realise not everyone is like that in their teens, but take what I'm saying relative to your own emotional scale).
I'm really curious to know what the experience of coming into your own personality in your early twenties is like from the perspective of people who 'trickled' their way into those changes. I started university at 19 and my personality began pouring out of me and changing rapidly as their were so many changes in my life and so many more people to adapt to, but I have friends who never left home and just slowly 'trickled' their way into being independent, and I'm curious to know how their experience of coming into their personality contrasts with examples such as my own.
If anyone could enlighten me regarding that last point, I'd be interested to hear it
