At your age one can't know everything that grown-up people know.
 Fyodor Dostoyevsky, The Brothers Karamazov (1880). copy citation

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Author Fyodor Dostoyevsky
Source The Brothers Karamazov
Topic age
Date 1880
Language English
Reference
Note Translated by Constance Garnett
Weblink http://www.gutenberg.org/files/28054/28054-h/28054-h.html https://en.wikisource.org/wiki/The_Brothers_Karamazov

Context

“She is crying, struggling ... hysterics.” “What is the matter?” cried Lise, in a tone of real anxiety. “Mamma, I shall be having hysterics, and not she!” “Lise, for mercy's sake, don't scream, don't persecute me. At your age one can't know everything that grown-up people know. I'll come and tell you everything you ought to know. Oh, mercy on us! I am coming, I am coming.... Hysterics is a good sign, Alexey Fyodorovitch; it's an excellent thing that she is hysterical. That's just as it ought to be.” source