The context of the following conversation is Austin  knew Alex was very smart and taught Alex to read when he was 4 years old.:
Austin says Alex is a really smart kid..
The friend responds Is that one of your students?.
Austin responds No, his my nephew I taught him how to read..
The friend responds Oh I see, at what age..
Austin responds He was 4 years old and picked up the pace quickly..
The friend responds Impressive you must be really proud of him..