Your biological clock? Yeah, it's ticking. But it's hard to know how fast. A new study out of University Medical Center Utrecht in the Netherlands says while menopause for most women begins sometime between 40 and 50, there is no real "average" age that marks the lack of fertility, meaning that some women may begin menopause as early as 30 and some well into their 60's. In other words, feel free to become more paranoid not knowing what end of that spectrum your body will fall. Happy Monday! [UPI]