As pre-pubescents, we wait for this mysterious visitor. In our twenties, we pray we get it each month because we want confirmation that we're not pregnant. Then we hit our 30s, and many of us are trying to get pregnant. It's no wonder we have a love/hate relationship with our periods.
At this very moment, there is a one in four chance that I have my period. That's because it comes like clockwork every 28 days. I have it for one week and then get three weeks 'off,' which makes mine pretty much the textbook version of a menstrual cycle. Except for one twist: I'm 54 years old.