How likely is pregnancy for a woman of 53?

Well your likelihood of becoming pregnant is more dependant upon your menopause than your age. If you have gone through menopause and have not had any bleeding for a full year, chances are you probably won't get pregnant. Although there are some stranges cases. If you cannot get pregnant naturally there is always IVF (in vitro fertilization ). Good luck! For example:

A 67 year old woman being pregnant:

http://www.mirror.co.uk/news/tm_objectid=15469896&method=full&siteid=94762&headline=how-did-i-get-pregnant-at-67----on-fresh-air-and-well-water-name_page.html

A 63 Year old woman becomes pregnant:

http://health.dailynewscentral.com/content/view/0002234/54/

Here is an article about women over 50 becoming pregnant:

http://media.www.thehilltoponline.com/media/storage/paper590/news/2004/11/19/NationWorld/Georgia.Native.Set.To.Become.Oldest.Woman.In.America.To.Give.Birth-811327.shtml