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> Well if you live long enough you're basically guaranteed dementia

Not true; I'm sure there is a relationship between age and prevalence of dementia, but it's far from a guarantee.

I've known too many centennials of surprisingly sound mind, and they eventually start having falls and the body can't heal sufficiently to fully recover.

Once the dementia sets in, though, that's another story. The aging process seems to advance quicker when dementia is present.

This would be a literal example of survivorship bias: https://en.wikipedia.org/wiki/Survivorship_bias

It's false because fairly low alcohol consumption correlates with a slighty longer life span:

https://www.nature.com/articles/s41598-022-11427-x

(Unfortunately it increases the risk of some cancers, too.)

It has been shown moderate alcohol use increases lifespan.