[rellic]

I worked for years at 14,000 ft and never got sick.
(I was in my 30’s and 40’s)This included lot of physical exertion.
Some people just don’t belong at altitude.

[af_vet_1981]

I worked for years at 14,000 ft and never got sick.

However most folks need to gradually work up to 14k; going up too fast tends to bring on altitude sickness which can be dangerous.

[rlmorel]

That is true, I believe. Some people do not belong at altitude. Altitude sickness is highly variable and from what I know of it, difficult to predict.