There are children who begin doing what they will be doing for the rest of their life the moment they can do it.
These children are the focus of Dahoum.
For example J.R.R. Tolkien writes in the 1951 letter to Milton Waldman, as seen in the beginning of The Silmarillion —
“Many children make up, or begin to make up, imaginary languages. I have been at it since I could write. But I have never stopped…”
A. C. Grayling says in a 2010 interview —
“…at the age of twelve I very randomly picked out the Charmides. I was bowled over by it, I thought it was absolutely wonderful.”