I suspect that's true for a lot of boomers, certainly is for me. I been happily mixing measurement systems for 50 odd years now. I generally pick the measuring system that gives me the smallest number of units to work with or is most convenient and easy to visualise for the task at hand. F'rinstance a model aeroplane will always have a span measured in inches ('cos small _whole_ number) and a weight measured to the nearest gramme ('cos easier than fractional ounces) and the components for it will likewise be measured in a mixture of imperial and metric units. As for yards and metres? A metre is just a yard with a superiority complex.
Except I'm not a boomer. I'm the very tail end of Gen X... And *NOT* a millennial!!!
P.S.
It's also extremely good fun to wind the youngsters up by using terms *they* find incomprehensible. Makes a very pleasant change to turn the tables on them.
I can do that much the same with continentals...
When they express confusion at the imperial system, I go into a rant. It works something like this:
"There's 3 barleycorns in an inch, 12 inches in a foot, 3 feet in a yard, 22 yards in a chain, 10 chains in a furlong 8 furlongs in a mile, 3 miles in a league, it's really not fucking difficult!!!"
Said at speed, tends to come as a shock...
J