It's never too late to learn technology skills, and you don't need deep expertise to be good at a technology job. That said, I'm a big proponent of starting STEM (science, technology, engineering and mathematics) skills at a young age, especially for girls.
My own story illustrates of the benefits of early STEM training. When I was 8 years old, I read an article about flying trains in a children's magazine, and I wrote a letter to the editor. That editor wrote me back and encouraged my interest in STEM. In eighth grade, I actually created a science fair project testing the durability of plastic, which helped me decide to go into engineering.
I had enormous support in high school and college from my teachers and parents. My experience inspires me to help young girls interested in STEM careers. There are so many cool digital and technology career options today.