Comment by cogman10

Evolution selects for one thing and one thing only, reproduction.

The answer to every "why hasn't evolution done x" question is selection pressure.

An enlarged prostate is something that people get in their 60s and later. Most people are done with reproduction long before that event. There is simply very little and very low selection pressure.

It's pretty much the reason why most humans have peak health into their 40s.

Don't expect evolution to "fix" anything for humans that doesn't commonly impact 20yos.