luffys vs Mr.been

 What is Luffy's age? or how old is luffy?

Luffy and Usopp were both 17 years of age pre-time skip and 19 years of age post-time skip. Zoro and Sanji were 19 years of age pre-time skip and 21 years of age post-time skip. Naomi was 18 years of age pre-time skip and 20 years of age post-time skip. Chopper was 15 years of age pre-time skip and 17 years of age post-time skip. 

Are Luffy 20 years of age? 

Toward the beginning of the series, Luffy is 17; the long-term time skirt happens. So, Luffy is as yet 19, yet he is very nearly 20 years of age. For more information visit theinfotrunk.