I'm in my thirties and I was taught metric at school but grew up using 'imperial' measurements. Britain is slooowly being dragged kicking and screaming by the EU to totally switch to metric but it's been going on since before I was born and we're still not quite there yet - the road system is still in miles and beer is still sold in pints (imperial pints, not US pints) in pubs, though spirits are sold in millilitres. Most things didn't go metric until about 10 years ago and they still put most weights and measures in imperial in small print next to the metric in large.