The test gives too much weight to one's postcode. I think this is because certain areas have a higher epidemiological risk of things like heart disease and stroke. So, even though I've never smoked, I'm not overweight, do not have cardiovascular disease nor have any family history of it, because of my postcode makes reference to Glasgow it thinks my heart age is higher than my actual age.
In short, it's a very clumsy epidemiological device.
As I told my GP, my current postcode does not tell him, or anyone else, anything about me. My postcode has been all over the place. I think I'll try the test with a few of the others.