As the story occurs, Juliet is approaching her fourteenth birthday. She was born on "Lammas Eve at night" (1 August), so Juliet's birthday is 31 July (1.3.19). Her birthday is "a fortnight hence", putting the action of the play in mid-July (1.3.17).
Also question is, how old is Juliet in the play?
In this work, Juliet is a young girl of 16, while Romeo is somewhat older. Shakespeare cuts three years off Juliet's age to make her the tender age of 13: as Old Capulet says to Paris, 'she hath not seen the change of fourteen years'.
How old was Romeo when he fell in love?
Juliet is just shy of her fourteenth birthday. Romeo's age isn't implicitly stated in the play, but it's assumed he is just a bit older - perhaps fifteen years old. Their youthfulness may explain some of their hasty decision-making. They were married, secretly; only Friar Laurence and the Nurse are in that loop.
How old was Juliet's mother?
According to calculations, Lady Capulet says, "By my count, I was your mother much upon this years that you are now a maid". This seems to say that Lady Capulet was thirteen when she had Juliet and since Juliet will be 14 years of age, at the conclusion of the ball, that would make Lady Capulet 27 years old.