According to Lord Capulet, Juliet "hath not seen the change of fourteen years", and the Nurse claims that on "Lammas Eve at night shall she be fourteen". When the Nurse asks how long it is till Lammas Eve, Lady Capulet tells her that it is in "a fortnight and odd days", which means Juliet's fourteenth birthday is in about two weeks from the setting of the play. Romeo's age is never given, but since he carries a sword, it can be assumed that he is not younger than Juliet's thirteen years. It is much more likely that, given his immature responses to problematic events in the play, that he is probably about sixteen or seventeen years old.
In William Shakespeare's Romeo and Juliet, the exact age of Romeo is never explicitly stated.
Juliet's age is 13, and she is almost about to turn 14. Based on puberty (girls hit puberty around 11-13, while it takes a few years longer for boys), we can definitely assume that Romeo is not younger than Juliet, but older.
How much older though?
He could be anywhere from 13 / 14 to his early twenties. We know he is "young" because several characters, including Friar Lawrence and the Nurse, state this adjective about him. Although "young" is relative, we can assume that in this time period and culture, "young" has to be younger than early twenties.
Juliet is 14 since it has been quoted by other characters that she was about to turn 14. Yet, Romeo is older than her not younger and I would say about 16 or 17 would be his age.
Juliet is just about to turn 14 and Romeo is abput 15 or 16
juliet is not yet 14 at the beginning of the play, we know tht romeo is older but not by how much
romeo is 55