How many breast implants are done each year in the US, UK and world wide? 
And on average, what size of cup are the doctors implanting? What is
the average age of females who are getting these done?

In a survey on the implant forum the most common type of enlargement
is from A to C size followed by B to C and B to D as a tie with the
25-29 and 30-34 age groups having surgery the most.

Source: http://www.implantforum.com/stats.html

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In America in 2004 there were 264,041 known breast augmentation procedures.

Source: http://www.plasticsurgery.org/public_education/2004Statistics.cfm

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I've found it mentioned online in several places that there are
approximately 10,000 breast augmentation procedures per year in the
UK.

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Pages and sites that may be useful to you:

http://www.dh.gov.uk/assetRoot/04/01/45/74/04014574.pdf - Department
of Health (UK) - Information for women considering breast implants
http://www.implantforum.com - A site containing lost of information
and statistics on all forms of implants especially breast
augmentations
http://www.plasticsurgery.org/public_education/ - The American Society
of Plastic Surgeon's website with lots of information on all sorts of
cosmetic procedures
http://www.justbreastimplants.com/ - A site containing lots of info,
personal stories and advice on all things breast implants.

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I hope some of this helps you!



Spanky

The ASAPS has the best plastic surgery stats you can find.  Also, the
second place i would look is Breast Implants USA as they also have a
ton of statistics and articles about breast augmentation.  The link is
<a href="http://www.breastimplantsusa.com">Breast Implants USA</a>