Whenever I hear the phrase "biological clock," I think of the lyrics to an Eve Six song that go like this: "The tick tock of the clock is painful, all sane and logical. I want to tear it off the wall."

Talk to any woman in her 30's and you're almost sure to hear the word "biological clock" come up in conversation.Once the clock winds down, no more babies or chance of having babies for her.

For pretty much ever, guys haven't worried about having a biological clock. As long as the plumbing has worked normally, guys have been able to become fathers even at incredibly old ages. So it might come as a surprise to find out that guys too have a biological clock!

Researchers have found that children of fathers who are 45-years-old or older have a higher risk of having relatively low IQs, autism, and are at greater risk of various mental illnesses, which could lead to suicide.

Scary business, huh?