I wanted to ask this question in the board, though I'm not sure if it's off-topic or not.
How old are japaneses when they finish learning kanjis in school?
In a compulsory education, it takes 6 + 3 = 9 years, just about 15 years old.
After that depends on the person who takes another schools high school for 3 years, prep school for the university 2-3 years, college 2-4 years and the university for 4 to 16 years. But I am sure after learning the dictionary 漢和辞典 usage, we were/'ve been not taught Kanji's, except the word is new or needs a help for understanding.