[npalli]

Wow, Doug McIlroy is 92 and still sharp, working through the implementation. Too many times, people complain of being over the hill when they hit 30!. Mental capability doesn't slow that dramatically (as physical) good perspective to have.

https://en.wikipedia.org/wiki/Douglas_McIlroy

[KerrAvon]

Well, there's also Dick Van Dyke, who's remained very physically capable as well as mentally sharp.

All of this varies, FWIW, with genetics and self-care. Over 30 is still pretty young, but nothing is universal; your heritage basically locks in your potential. There are chronically ill young people who feel much older than some 70 year olds.

Also, hearing loss is strongly correlated with loss of mental acuity and worse; hearing aids are essential if you have loss. Get your old self some current AirPods Pro.