I've been catching up on Jonas Hansson's skating videos, and I found a perfect example of this phenomenon. First, here is a video of a skater named Richie Eisler: he is nine months older than me-- so, a fellow "Xennial". Second, here is a video of another skater, Eugen Enin, who was born exactly ten years later-- 1991, versus 1981.
I cropped photographs of them side-by-side. 'Nuff said:
Judging by the aforelinked video, Eugen Enin is a world class skater-- but as is the case with modern footballers, who almost universally look extraordinarily effeminate, how much better would they be if they married modern-day training and diet, to higher testosterone levels?