As far as computing goes, well into the 70s, computers were a mainly female dominated industry. In the 80's people started getting computers into their own homes and elementary schools. Then people could learn computer skills without attending a university. If I want speculate why women dominated at that time, I would guess it started in the 40s during the war. Civilian women in mathematics (like Grace Hopper) were recruited into the computer industry to help with the war effort while many of the men were abroad. Grace became an officer in the Navy as a result of her previous professorship. Women who were not college educated who had experience typing were likely recruited into computing as well to do data entry and to convert hand written programs into punch cards and such. Many of them I'm sure picked up some knowledge of programming along the way.