[kansface]

I'm not sure how you'd define cool shit, but we have actual data for scientific breakthroughs by age: see http://www.theatlantic.com/health/archive/2014/02/big-breakt....

|The authors examined the high points of the careers of both great inventors and Nobel-Prize winning scientists, and they found that the late 30s were the sweet spot for strokes of genius

The gist is that this number (38ish) has been slowly creeping up over the past century; it is generally higher in those fields which require a synthesis of huge amounts of knowledge (experimentalists) and earlier among theorists. Notice that essentially no one has done anything groundbreaking in their 50s (yet).