However, hormone-replacement therapy does not maintain a woman's fertility into old age. Lexi Krock is editorial assistant of NOVA Online.

Researchers wrote: "Falling fertility rates shift the demographic balance toward youth scarcity and more older people, who are dependent on a shrinking working-age population. Longer life spans ...

The researchers found that old males have more sperm than ... it is just the presence of seminal fluid or its age too that affects male fertility, and to understand the role of female sperm ...

Their research is the first to indicate that female fertility declines before the age of 30. But the doctors said the older women studied were not less able to conceive - it just took them longer.

I was pregnant - the old fashioned way,' Carolyn Savage writes ... miscarriage rates as high as 90per cent for a woman my age,' she writes. 'I told Sean later that night and followed the news ...

24, JANUARY - JUNE 2011 A new relational method for smoothing an... Age-specific fertility rates can be smoothed using parametric models or splines. Alternatively a relational model can be used which ...