(if anything at all)

And why?

This was keeping me up all night (no, really), and I'm getting increasingly irritated by it. Why is it that so many young-ish people give their height and weight in stone/pounds and feet/inches? If metric measurements have been around for your lifetime, and you use them as default for the height & weight for non-human things, why on earth use imperial for yourself? I guess people tend to use miles too. And pints. Why? Why isn't everything one system?

If you use imperial for height / weight, you still know what it is in metric too, right? Or don't you? I went to the gymn when I was 16 or something, and the machines were definitely metric there, so surely you'd have to know it. And if you know it, why would you use imperial?

I don't get it :-\