My girlfriend wont even listen to me when I speak of bitcoin. She thinks I waste my time and bitcoin wont succeed. Her younger brother 14 years old always asking me questions about bitcoin and he actually set up an account on this forum and is very interested in the concept. However I can speak for all women but the few in my life can careless about bitcoin.
See that the thing about life what one person/girl likes is not the same as the other, my girl has warmed to it and now trades altcoins and i must say is pretty good "better than me at least" lol
But,,, she had no interest in it for ages and then one day i needed her to sell some coin and talked her threw it on the phone when i was away and all went well, i told her how much we made on that trade and she begun researching .
That is awesome that your little bro has got into it maybe he gets interested in programming and will be kicking some ass in future, good luck to him.
So to answer yes they do use it