This highly depends on the child itself, the parents, the circumstances/country/culture in which the child grows up in and to some degree, the sex of the child too. I was introduced to computers at the age of 5 and it has definitely helped me become the software developer I am today.
I'd say a huge reason why there aren't more women in technology is because girls aren't introduced to computers (and/or gaming) early enough, or as early as most boys are.