I don’t know how to answer this question. Life is a continuum and not distinct phases. Sometimes I behave very much as an adult and sometimes like a child. As a young teen in some ways I felt I was very adult in the way I lived and how I saw the world, and as an adult I’ve often felt very much like a child- unable to understand a situation, a person, or how to feel or act. Maybe some of that is anxiety, imposter syndrome, or depression- all of which are big parts of my life- and can manifest at work in feeling like a child, especially in my line of work where I’m often dealing with very senior leaders and it’s easy to feel underconfident, confused, vulnerable. Having said all this, I remember feeling like an adult watching Alien for the first time as a kid, or surreptitiously getting drunk for the first time, or living independently for the first time. Was I an adult doing any of those things? Probably not. How do you define being a kid or being an adult other than by age? I’m definitely not an adult sometimes even now, and I’m 42!