Just out of curiosity, at what age is a woman on the shelf'? And a man?

Question

This question was raised by the reply of a former question.

And I thought it could be interesting to pose it.

Meaning of 'On the shelf': http://dictionary.cambridge.org/define.asp?key=72669&dict=CALD

Answer 1

On the shelf means "up on the market"?

If so, I would say, there is no specific age where a man or a woman is considered "marketable", for men and women marry or have relationship at different age. But generally, the most ideal time where a woman is considered ready is when she is between her 20's and 30's and for man in his mid 20's to 30's.

Answer 2

"on the shelf?" as in "available" or "put away?" I'm not familiar with the usage here.