Context: One of my friends , whom I \' ve known for years , has a baby son . Recently he said the phrase " They grow up so fast ... " to me . I felt so old at the time .
Question: Why is the narrator 's friend so proud ?
Option 0: They are growing up fast .
Option 1: They are very fast .
Option 2: None of the above choices .
Option 3: They are a new parent .
Answer: 3