EDIT: Just in case people are confused, since several of you seem to be: this is a JOKE. It is NOT a serious theory.
EDIT2: Am accepting new commissions, if you're interested.
by the power of grayskull xD
Then she stopped aging in nightmare moon form. So when she turned back, her body had a lot
of catching up to do. Her pituitary gland went into overdrive, and she quickly took the form of herself,
but 1000 years older.
She aged beautifully by the way.
And yeah, some people take joke theories too far. Still, I generally figure that if people want to headcanon my weird/silly ideas then they can go right ahead.