An old video I found of Cheng Man Ching doing Tai Chi. This is a classic. Don't know how he would do in actual combat but take it for what it's worth. He seems very agile for an old man.
W. Cheung and Emin Boztepe fighting like little kids. This is why I lost faith in Wing Chun. W. Cheung is suppose to be one of the top Wing Chun masters, descendent from the line of Yipman.