What is the most common age when a girl in love with a guy?

Girls can have crushes on people they don't know but like the look of e.g. film stars or actors from the age of 10 to 11 but real love starts at around 14 years of age is they have been exposed to boys a lot and are not shy but those who are not used to being around boys can go all the way up to 17. Hope this helps!