Tougher competition*
So Floyd Mayweather has a strength based style? Anderson Silva? Tyron Woodley?
LOL!
I wish I could say I've never seen someone make so many excuses for a fighter in my life, but that's the standard here on Sherdog. Where people point to physical decline as young as 25, instead of dealing with the fact that this 25 year old sport is still developing and fighters are getting better - some faster than others.
Yet for all of your "physiological changes" you still havn't be able to tell me why GSP who is the same age as Tyron is can't fight him. LOL!