UK here - never used stone, LBs or pints as a measurement
If I was measuring bodyweight, I would use KG. Grams for anything light.
The only time I see Milk measured in pints, is bottles or cartons of standard dairy milk in supermarkets. Any other milk is litres, including dairy such as Jersey / Cream top milk
I'm the same age
I found that stone was used for weight commonly up until recent times. I've been asked in person and one form what my weight is in kg (I think maybe health insurance?)
Same with Lbs and pints, but also milk. Every standard plastic milk carton is measured in pints, usually with ml/l printed on them these days. Smallest carton? 1 pint. Most common? 4. Giant carton 6 etc