Question: how old are the members of the strawhat crew?
Answer: Zoro and Sanji were 19 years old pre-timeskip, and 21 years old post-timeskip. Nami was 18 years old pre-timeskip, and 20 years old post-timeskip. Chopper was 15 years old pre-timeskip, and 17 years old post-timeskip. Robin was 28 years old pre-timeskip, and 30 years old post-timeskip.