Go Away Baby Urge!!!

My five-year-old daughter is a patient at our area Children's Hospital for bladder spasms.  While there on Monday with her, there were soooo many newborn babies!  Oh...my...gosh...talk about getting the urge for another baby.  I had to get out of there!!  Every where I looked, there were moms and/or dads pushing little ones in fancy strollers, like the bob revolution se, or cooing at their little ones.

When does the urge to stop having children go away completely? I thought I'd settled to the idea that we were done with kids. I turn 40 this year and hubby is 45. We've had our kids already. We don't need to add to our family.  Eight is enough (six kids, two adults).  So, when does the urge go away?