emoo
Hyper Poster
There's already signage outside major thrill rides for this sort of thing across many parts of Asia, usually advising/stating no riders aged above 55 (China) to 65 (Japan).
In fact, it's already at Fuji-Q:
Never seen it enforced, not that it's particularly likely I would have.
Well that puts a crimp on my idea to have a retirement gap year in Asia as a hand waver in on of the larger parks (free annual pass please...)