How old is the straw hats?
Luffy and Usopp were both 17 years old pre-timeskip, and 19 years old post-timeskip. 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.