Mr. James Finley, 25 years with Tony Yang. The only person over the 20 years I have been with Tony Yang that practiced xiao baji and the da qiang on an almost daily basis for 9 years. He is 6'2" so those postures are pretty deep for someone in their late 40s at that time. At 54 he still has it.
http://youtube.com/watch?v=FG6GtPWhHZM