Who invented work/life balance?

We all know the Boomers are known for their fierce commitment to their jobs. And one of the few nice things to be repeatedly written about Gen Xers is their commitment to a work/life balance, family, and friends. However, I saw a post recently by a Millenial who says that it's actually her generation who really has taken a stand for balance.

I'm not sure what to think. I hate to be one of those angry Gen Xers, but come on, isn't it the Gen X dads who have really taken advantage of paternity leave (including my own husband whose career probably took a hit because of it)? Isn't it the Gen X moms who made very deliberate, thoughtful decision regarding full-time or part-time jobs - or staying home full time? Isn't it the Gen Xers who took the grief in the late 90s and early 21st Century for their unwillingness to give all to their employer?

It all makes me long for the good old days when only the Boomers didn't understand us.