Commenting only on their professional lives. Their investment strategy was generally not a high stress one, they clearly enjoy their work so one could assume their professional lives were generally low stress.

This is a fair point. If you exclude the early part of his life, working as an asset manager is easy work. Most jobs are much more stressful. Basically, you sit around and read annual/quarterly reports and try to find the next company to buy. To be clear, this type of asset management is similar to private equity. They are buying whole companies. This business is much lower volatility than buying/selling stocks for fund management. Also: Fewer transactions. So I would say the 2nd half of his life was low stress (outsider's view, of course).

They lived frugal lives, with everything needed covered for probably 10'000 years ahead. Large families, plenty of friends and a lot of wisdom. Yeah, I think Charlie and Warren's life's have way less stress than most people do.

There a tribe in Ecuador with reduced height studied by Walter Longo etc. They have a mutation in their growth hormone receptor, that means that they experience less effect of human growth hormone, hence reduced height. And their lifestyle is rather unhealthy: alcohol, smoking, sugars, junk food, obesity etc. Yet they rarely experience diabetes, cancer etc probably due to reduced mTOR pathway activation.

In the context of this specific post regarding Charlie Munger, you can't say that it's genetics unless you measure specific genes. He could be 100x Bryan Johnson, but Bryan Johnson at least makes his protocols open for use. And Munger didn't even bother to make a genetics test with his curiosity, thus providing no essential value to human civilization.