About 13. Because her father wanted her to be 14 before she got married but it is unclear weather or not she turns 14 during the play
she was probably fourteen or thirteen
I believe she was approaching her fourteenth birthday so that would make her thirteen.
Only 13 years old. She would have been fourteen in another 2 weeks.
Juliet was 13 but was only about two weeks from her fourteenth birthday.
Juliet is two weeks shy of 14 years.