Let me apply some simple math to Australia & take nothing away from their general love for American muscle. Let's assume these numbers are accurate (I just googled it)

Population:Australia
20,090,437 (July 2005 est.)
Age structure:
0-14 years: 19.8% (male:2,038,809; female:1,943,563)
15-64 years: 67.2% (male:6,815,600; female:6,695,189)
65 years and over: 12.9% (male:1,145,274; female:1,452,002) (2005)

Population:USA
295,734,134 (July 2005 est.)
Age structure:
0-14 years: 20.6% (male:31,095,725; female:29,703,997)
15-64 years: 67% (male:98,914,382; female:99,324,126)
65 years and over: 12.4% (male:15,298,676; female:21,397,228) (2005)

Obviously the market opportunity is well over 10 times that of Australia. Hey, I'd love the whole world to get one but let's start here and build the base.