I’ve been working full-time from home for quite some time now. I would say I started somewhere around 2011. My son was about 12 years old. Even though my job had an office, I was given the option to work from home. I went into the office here and there, but not enough to really say I worked out of the house.
It was important to me to work from home because, as the primary parent, I wanted to be able to have the flexibility (which means working the hours I missed in the evening) to be there for doctor appointments, school meetings and so on.