Janie - I don't believe your mathematics. no way. the numbers just don't add up to the woman I have met.

"Crone" in many ways is a function - and I think in todays society the traditional definition may become slightly irrelavent - I know woman who are prime "crone" material - though only in their late 20's, early 30's.

Likewise there is a dang high percentage who will never reach cronehood no matter how old they get.

unfortunately "crone" has some negative connotations that it shouldn't.