Who said "The Winter of 1975 was when Hassan stopped smiling."?

This quote is attributed to Amir.

The Winter of 1975 was when Hassan stopped smiling. - Amir

"The Winter of 1975 was when Hassan stopped smiling."

Amir

Character in The Kite Runner

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"I became what I am today at the age of twelve, on a frigid December day in 1975."

"When you kill for the first time, you lose your innocence."

"Theft and lying were part of their world."

"I could wade into this river, let my sins drown to the bottom."