OT: getting stone-d, was Re: [LMB] Miles's exact height?

[louann at millerdome.com]

At 09:01 AM 8/2/2006 +0100, Derry Thompson wrote:
James at cessnadriver at gmail.com said on Tue, 1 Aug 2006 23:08:25 -0700

>Which then begs the question, does anyone regularly give their weight
>in stones versus pounds these days? Or do people actually actively ask
>for a person's weight in stones?
>
>Or do people do it to be fancy?

Using stones is the default in the UK.  I don't think I've ever heard
anyone here give their weight in pounds. The younger generation use Kilos :).
(end quote)

To a native speaker of UK English, is stone the normal method of giving
any _other_ weight besides human beings? E.g. "I don't think that
ultra-compact hybrid car weighs over forty stone, I'd be afraid to drive
it on the M1."

Also is there a minimum age/weight of person below which it would sound
silly to use stone? E.g. "The baby was growing so fast we were afraid he'd
be a full stone when he was born," or "That child must be three stone
already, he's all muscle."

Louann, linguistically curious.