detroitwingchun.com You are missing the point. One can't rely on physical strength especially later in life. One can't UFC, full contact or whatever at 60, 70, 80, or 90 years old (most people don't practice martial arts for this reason).
Physical strength will disipate with age but if you practice Iron Shirt, Chi Gong, or any other Internal Martial art this process will be slowed down. That is why the above was created and expanded on by Daoist (1st) and Shaolin Monks (2nd) all those years ago. To keep muscle and bone density and the whole body supple.
Chang San Feng's Internal ideas/principals still live on today and have been used in the past (History) by poeple like: Yip Man, Dao Mo, Eddie Chong, Agustine Fong, Leung Sheung, Duncan Leung, Woo Fai Ching, Sun Lu Tang or any other Internal Martial Artist throughout history.
They all have (Above names) what 'Bruce Leroy' was searching for in the movie 'The Last Daragon' the "Glow". "Is it in Ya".
And since many of us Internal Artists (Grandmasters included) spend our time cultivating these Ideas along with our Mind, Body and Spirit we don't bother with UFC pipe dreams. Really, Have you ever taken down a man, old or young, who has Internal power. It is pretty darn hard. If one practices this stuff then eventually one will get the "GLOW"
"Riddle me this" should have read "why are ther no 50, 60, or 70 yr. old guys fighting in UFC or Pride" But i will give you 'Couture'.
As you said, "Pro fighting is a young mans sport" and we should leave it to the young men, whatever the discipline or rules. Anyone can cross-train all they want but, as one ages and there is no supplementing the training with Chi Gong, Iron Shirt or any of the Internal methods then it "may" be hard to grapple, hold, or take down whomever one is fighting. Doe you as a MMA practice Internal methods?
Like I said, you "Can't Disregard 2-3 thousand years of Chinese Martial History and Tradition". "Our Past Is Our Future". Wing Chun is new compared to other martial styles, but it, like all other Asian-based martial arts share one common denominator. They all have and share the same 2-3 thousand year old Chinese History and Traditon as its foundation. Even MMA has its History and Foundations. Do we disregard that too?
I must go now. Must continue the search for the "Glow"