Anecdotal: I grew up knowing how to cook and prepare meals since I was 10-11 years old or so. It was a complete shock after college to find out that my roommate (that I had gone to school with) could barely boil water.
I just assumed everyone knew how to cook at least basic things because that was how I was raised. He was raised with his mom doing everything for him, so after graduating (meal plans in college meant no need to cook), he literally could barely make toast. For the first 6 months after living together, his dinner usually came from Burger King.
Now I find that people my age (late 40's) and older are often the same way. Somehow they've managed to spend their entire lives eating takeout or microwaved meals.
In my single days, I managed to impress any number of women simply because I made them home-cooked meals. Insane, but true.