Here is the link to the full play, which I used for the quotes in my answer:
In Act 1 Scene 2, we hear a conversation between Capulet and Paris about Juliet. Paris wishes to marry Juliet, but Capulet believes that Juliet is still too young to get married:
My child is yet a stranger in the world.She hath not seen the change of fourteen years.Let two more summers wither in their prideEre we may think her ripe to be a bride.
Read o'er the volume of young Paris' faceAnd find delight writ there with beauty’s pen.Examine every married lineamentAnd see how one another lends content,And what obscured in this fair volume liesFind written in the margin of his eyes.
Juliet's parents think she's too young to understand marriage and Juliet is not interested in marrying Paris(obviously).