Is that you in the clip?That might be because the old men know competitive chi sau is ******** and wouldn't lower themselves by taking part.
If they were to go in it however , they would go through them like a hot knife through butter.
Wing Chun is purely based on skill it has nothing to with youth or muscular strength , the head of our lineage passed away a week and a bit ago but even at his advanced age he could throw people around like rag dolls and his power was quite literally frightening.
[video=youtube_share;YWjsr7Yr5tY]http://youtu.be/YWjsr7Yr5tY[/video]