Psychology definition for Control Condition (control group) in normal everyday language, edited by psychologists, professors and leading students. Help us get better.
sanji [from onepiece] He is born March 2nd, a Pisces. His birthday comes from San, which can mean the third or three, and Ji which means the second. The second day of the third month. he is 19.
From this it can be concluded that Natsu is at least 14 years old. That is the only thing we can know for sure. But as to how old he really is, there is no definite answer. The Battle of Fairy Tail suggest that he might be older than 80 years old, but it was never mentioned explicitly that he is.