we went metric in 70s, but that doesnt always apply to everything. people still buy eighths and quarters, guys have 5 inch wangs, and people are still 6 feet tall.I do for my own height as I know what it is in feet and inches but I use feet and inches for everyone else. Makes it easier to visualise.
If you're in the US you work on Imperial measurements and weights whereas we went to metric in the 70s.
in the 70s they also tried spelling it 'department of helth'. did you jump on that bandwagon too?