Does the aging effect of a Ghost every time on a failed save of 5+?

@JeremyECrawford Does the aging effect of a Ghost every time on a failed save of 5+? Or only on initial contact with Horrifying Visage?

— Hanno Ziegler (@ronin_sama) January 10, 2016

Horrifying Visage ages you every time you fail a save against it by 5 or more. #DnD https://t.co/sqrg6dlU9r

— Jeremy Crawford (@JeremyECrawford) January 16, 2016