why not "the lawyer is the youngest" ? because there is no definite article ?
Also because it's νεότατος rather than νεότερος.
But νεότερος does not mean youngest. It's younger, isn't it?
ο δικηγόρος είναι ο νεότερος από αυτούς = the lawyer is the youngest of them
Very is not given as a word
Why is 'The lawyer is very new' not accepted?
Not "πολύ νέος"?
You can use the periphrastic πολύ νέος.