I'll try to find the study I saw once.
It said in effect that if a woman that married by the time she's 30, she has a 65% chance of NEVER being married. At 35 years old, the likelyhood that she will never marry jumps to 90%
I find that hard to beleive. All the single 40 something women around here seem to have no problem getting boyfriends or getting married.