In May of 1997, I wrote this list. I had passed my thirtieth birthday and wanted to tell younger women about the things I really wished I’d had and known by that important milestone. I guess people agreed with what I had to say, because a few years later the list showed up in my e-mail inbox; a friend had forwarded it to me for my reading pleasure, completely unaware that I was the author. After that, every month or two someone would send it to me and I’d immediately hit “reply all” and type, “Hey, that was me! I wrote that for Glamour.” (After a while, I don’t think anyone believed me.) The list became a phenomenon; posted on hundreds of websites, it was attributed to everyone from Jesse Jackson to Maya Angelou to Hillary Clinton. Someone even published it as an anonymously written book. As I read over these lines now, so many of them still seem worth having and knowing—whether you’re 30 or 22 or 75. Being a little older and a little wiser, I’ve plugged in a few new “shoulds.” By all means, add some of your own.