I have both pints and litres of milk in my fridge. Eggs are still sold in 6s or 12s. Fabric was sold by length in metres but width in inches for a while but is now fully metric.
Meanwhile many children don't know what clockwise means because they only use digital clocks.
I think one reason younger people have more problems with arithmetic isn't just they can do it all online but also that as young children we had to be able to use £sd, weird weight measures, use analogue clocks, etc.