Board Thread:General Discussion/@comment-38275329-20190926190625/@comment-1827503-20190928010825

In any case, with V5's timeline tied to the start of Haven's fall semester, Ruby's 17th birthday falls in the range of V6. (And indeed, the cited source says she turned 17 in the middle of it.)

If we take the Lightning Round as valid with both Ruby's age and the school year start date, then it logically follows that slightly more than two years have passed since series start; this means WBY/JNR are implied to be 19.

If the September 27 date for Pyrrha's birthday is valid, she would have turned 19 during or immediately after V5. (Which would make her likely the youngest of JNPR.)