At 5: If someone likes the same colour as you, then you're probably friends for life.
At 15: Making a new friend is a huge deal, you have agree on pretty much everything or there is no way you can be friends.
At 25: The hardest part about making a new friend is dragging yourself off the sofa after work to go out for a drink with them.
2.
What you do when you hang out:
At 5: You play games and pretend to be princesses or dragons or space invaders.
At 15: You talk about crushes and maybe try smoking for the first time.
At 25: You drink wine. Whatever you do involves wine.
At 5: These mainly involve jealousy over toys. Afterwards, everyone cries, an adult intervenes, and everything is forgotten by tomorrow.
At 15: You don't talk for days and it feels like your world has ended.
At 25: Most arguments are about the last slice of pizza.
At 5: Bitching about someone usually revolves around how smelly they are.
At 15: Bitching is a way of life.
At 25: You still bitch all the time, you're just much better at it.
At 5: Probably just a cheap way for your parents to get a babysitter.
At 15: You’d talk about sex, or what you imagine sex was like.
At 25: You will only sleep in someone else's bed if you have to, or for an "adult sleepover".
At 5: You're pretty straight talking with each other face to face, everything else goes through your parents.
At 15: You talked all day at school and then messaged on MSN all evening when you got home.
At 25: You send sporadic texts until the rare moment when your both free to have a proper catch up.
At 5: They give you half their chocolate bar when your mum makes you a crappy packed lunch.
At 15: They listen to you cry for an hour on the phone about that boy.
At 25: They listen to you cry, they give you some damn good advice, and then they make you belly laugh.
8.
How you tell everyone you're best friends:
At 5: You probably pretended to get married.
At 15: You made each other friendship bracelets and swore you'd never take them off.
At 25: You don't need to shout about it.