I disagree with everything you said, including the offhanded remark about the constructiveness of my response. As far as being constructive goes, I clearly laid out what I believe without attacking anyone, which is more than I can say about your question "Serious question: do you really think that was the previous comment's claim?" that I perceive as a mock inquiry despite the disclaimer of being serious.

Between so many aspects I'd like to focus specifically on what I perceive to be the core issue where you state:

> "But I know very few people who would think that someone's intellectual output or energy keeps growing past their 20's."

Let's not even try to discuss how many people we think are on either side of this. Let's instead talk about what we personally believe. And in this context I assert that it's very sad and indicative of a huge waste if a person's output doesn't increase meaningfully with increasing age, after all of the experience that should have gone along with it. It also sounds like there is a pseudo-biological assumption here that the brain basically goes into standby mode after you a person goes through their twenties; I don't believe that's true.

I don't think we're going to come to a consensus about this.