@WriterDude,
It's going to depend on what you're going for with your story.
If you are looking for shock value, then don't even ask. If you are looking for something romantic, however, then the boy in this instance is a minor and would be a major turn-off for a lot of readers.
And another thing: when your character is in her twenties, she's a woman and not a girl.
Language matters when we write.