I spent most of this week, without makeup. No comments about looking tired or different. Just wasn't up to it. That's not unusual for me. I'm well over 18.
Once worked with a woman who's husband had never seen her without it. She made a point to wake up early. But she also owned that neurosis and didn't pass it onto her daughter, who I'd hung out with a while. It was just her, she admitted it was her.
Makeup is such an odd thing to war over.
No, it's not mandatory to wear, lest you sign a work contract that says so. Some legal offices are sticklers, especially in business contract law firms. Skirts mandatory, too, type. Some financial firms, same thing.