Ya, we have had a couple guys fly west, or almost, while they were actually flying west. All were in their mid to late fifties. The combination of today’s schedules, stress, and the proposed increase of age is a recipe for disaster IMHO.
Unless you were there for the autopsy...you really don't know what caused those cardiac events other than a clogged artery ( -ies).
3 guys is not an epidemic...nor cause for alarm. If they or anybody is really stressed from this job...they really should look for something else...or get on a treadmill.