Which means that out of gamers (however they define it), half are women. The whole subject isn't relevant for non gamers.
Obviously not. My mother is not and never has been "A Gamer", but has purchased many games for me - as a child (when gaming was first moving from arcades to the home), and as occasional gifts more recently... also partners (though they play some 'flash games' occasionally so would probably be "Gamers" by a loose definition.
I imagine that most games bought for minors are purchased by parents, and more commonly this falls to women ~ if only because many single parent families are female parent predominantly because of many factors including court biases.