I have grandparents and I can 100% guarantee that they do laugh a lot.

Fact checked: ❌ information false.

Exactly 84? Oh it’s low quality facts. Did you just quote Edgar Allan Poe? Thought so.

True, then they start to cackle (sorry for the ageism)

84? Suppose that’s about right, with some exceptions.

One factor seems to hit just after retirement, and the speed at which sense-of-humor dies correlates to the size of the retiree’s front lawn… & the likelihood and number of neighborhood kids who might walk around on it.