I don't have a problem with having friends who are, say, three or so years younger than me. I mean, it gets a little weird when you consider sibling ages, but it's eminently overlookable.
But then I realize OMG YOU NEVER LIVED IN THE EIGHTIES, and everything just gets a little awkward.
Also, a gripe: It bothers me to no end when folks say they're feeling sick, and that their remedy is (or someone suggests the remedy of) eating a whole lot of vitamins, or drinking a lot of vitamin C, or eating ?garlic pills?. Okay, people, it doesn't work. Sucking down Emergen-C is not a valid way to fight off a cold or the sniffles; vitamin C is ascorbic acid, and your body can only absorb so much of it at any time. If you drink a whole lot of vit C, you're just making your pee more expensive (and possibly a bit fragrant, but the jury's still out).