Puppy love, sometimes known as a crush, is an informal phrase describing sentiments of romantic or platonic love that are common during childhood and early adolescence, particularly in children aged 4–14. It gets its name from its likeness to the devoted, worshipful adoration that a puppy may feel. Puppies usually fall in love with the first thing they see, but since young girls often play with dolls or other toys, they don't always get a chance to show their puppies what they're made of. If you're a girl around this age, you know what I'm talking about: someone catches your eye, you both enjoy playing together, and before you know it, you have a puppy girlfriend. It's not uncommon for these feelings to last through adulthood. Some famous examples include Marilyn Monroe and John Lennon. The origin of the term "puppy love" is unclear. Some say it comes from the resemblance many young girls' friendships have to puppies and dogs who live together and love each other dearly, while others say it comes from the fact that young girls tend to play with toy dogs when they're kids.