They're the ones where, within an hour, you're talking about everything and anything from family dramas, to personal setbacks, to your new hairdo and how much weight you've put on/lost since last time. And you all know the ins and outs of each other's dramas, setbacks and weights ... like it or not, nothing is sacred.
They'll mention in passing how their child's sniffing must be driving you insane - because they know your phobia of irritating, repetitive noises. They mockingly inquire after your stroke (possibly a pinched nerve) and heart attack (perhaps indigestion) because they know your hypochondria and have been there through your Gulf War syndrome, meningitis and brain tumour. They know and accept your weirdness and flaws as well as you know and accept theirs.
They're the friendships where it's fine to have a wee cry in the middle of a celebratory dinner, because you're feeling sad, then before you even know it you're all laughing again, not because you feel you have to but because that's where the conversation has taken you. And damn it, when there's champagne and fine food, and a view over a beautiful city, and you're all together again, how can you not be happy?
Sure, the best friends are not always the oldest ones - new friends too are precious. But there's something about a shared history that makes me feel all wrapped up in a safe blanket and lets the walls tumble down. How can there be anything to hide when you've been together through the good, the bad and the ugly?
Dancing for hours then skipping home through deserted Barcelona streets at sunrise. Laughing all the way.
Helping each other through heartbreaks and, boy, some of those heartbreaks felt like they'd never end. The dilemmas and failings and weaknesses you trusted each other with and loved each other just the same.
That time you kissed the same boy, and the fallout that threatened to ruin the friendship forever ... but, of course, it didn't. Do we even remember his name?
So here's to old friends. Better than chocolate, wine or ice cream. Though not better than old friends, chocolate, wine and ice cream combined. Now that's the perfect pick me up.