Compared with a woman aged 25, the chances to
give birth to a child diminish by half from the
age of about 35 onwards.

Freezing eggs can help to preserve a woman’s fertility
that may decline for whatever reasons!

As to the concept of 'social egg freezing' we would recommend the precautionary storage of 10 – 30 eggs.

The cryopreservation of oocytes using current “vitrification” technologies shows pregnancy rates after thawing and fertilization that can be compared to those achieved by using “fresh” eggs. (http://en.wikipedia.org/wiki/Oocyte_cryopreservation)

This procedure is regarded as safe and therefore has been increasingly acknowledged by international societies such as the ASRM (http://www.asrm.org) (http://www.infertile.com/inthenew/sci/fert-steril.htm; http://www.infertile.com/infertility-treatments/preserving-your-fertility.htm).