I know it's a memel, but as a millennial with a 6MT, I know far more people in my age group who own manual cars, than older people (say over 45) who can drive one period. My brother an I are capable, as is my dad; one of my four aunts can, and none of my 7 grandparents can either. If I start looking at co-workers (fairly broad and distributed age range of 20-70) the same rings true, the only people daily-driving manuals are under 40, while easily 2/3 of that 20-45 age group can drive manual; conversely of those in the 46+ range, it seems closer to 1/3 are capable of driving, and almost all of them because they have a manual classic.

People seem to forget the automatic transmission started mass production in 1939, and take-rates in the US well-exceeded 50% by the late '60s/early '70s.